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Js, трюки, наблюдения, бенчмарки и как Лиса уничтожает Хром. Я протестировал всё, что вам было лень / Хабр
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<span>Js, трюки, наблюдения, бенчмарки и как Лиса уничтожает Хром. Я протестировал всё, что вам было лень</span>
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<a href="https://habr.com/ru/company/ruvds/blog/712386/">
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</div></a><i><font color="#999999">Картинка, конечно, стронгли анрилейтед</font></i><br />
<br />
Разные трюки я тестировал на Google Chrome 107.0.5304.107 и Mozilla Firefox 107.0 на Windows 10.<br />
<br />
Чтобы результаты всегда были железно воспроизводимыми, я отключил все С-Stateы, ядра зафиксировал на 5 ГГц.<br />
<br />
У меня 9900К, это Coffee Lake c AVX256, какие оптимизации применит Jit для вашего процессора — я не знаю, результат на вашем компьютере может отличаться от моего, в т.ч. из-за микроархитектуры процессора.<br />
<br />
Скорость парсинга кода тоже входит в бенчмарк, поэтому браузер с быстрым парсером будет впереди.<br />
<a name="habracut" id="habracut"></a><br />
<h2>
<font color="#3AC1EF">Есть ли у переменной оверхед?</font>
</h2><br />
Есть ли смысл использовать только dot notation? Какова цена выноса лишней переменной?<br />
<br />
<pre><code class="javascript hljs"><span class="hljs-keyword">var</span> array = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Array</span>(<span class="hljs-number">65535</span>).fill()
<span class="hljs-comment">// 3</span>
<span class="hljs-keyword">var</span> a = array.map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x)
<span class="hljs-keyword">var</span> b = array.map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x)
<span class="hljs-keyword">var</span> c = array.map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x)
<span class="hljs-comment">// 2</span>
<span class="hljs-keyword">var</span> a = array.map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x)
<span class="hljs-keyword">var</span> b = array.map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x).map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x)
<span class="hljs-comment">// 1</span>
<span class="hljs-keyword">var</span> a = array.map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x).map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x).map(<span class="hljs-function">(<span class="hljs-params">x</span>) =&gt;</span> x)</code></pre><br />
Чтобы узнать, гоняет ли браузер память туда-сюда, делаем мы <code>.map</code> на массив длиной 65535 с нулями внутри. <a href="https://www.measurethat.net/Benchmarks/Show/22097/0/1-var-vs-2-vars-vs-3-vars">Линк</a>.<br />
<br />
<div style="text-align:center;"></div><i><font color="#999999">Здесь и далее в качестве единицы измерения на графиках будет указано кол-во выполнений кода в секунду, включая парсинг и компиляцию. Больше — лучше</font></i><br />
<br />
Хром не заметил разницы, а вот лиса заметила. Применительно к лисе, у лишней переменной есть измеряемый оверхед.<br />
<br />
<h2>
<font color="#3AC1EF">Есть ли разница между var, let, const или их отсутствием?</font>
</h2><br />
<div style="text-align:center;"></div><br />
Проверим. Используя разные биндинги — создадим POJO с переменной <code>е</code>. Потом добавим ему функцию <code>о</code> и запустим эту функцию. Бенчмарк простой, но движущихся частей много. <a href="https://www.measurethat.net/Benchmarks/Show/22083/0/const-vs-let-vs-var-vs-sloppy">Линк</a>.<br />
<br />
<pre><code class="javascript hljs"><span class="hljs-keyword">var</span> g = { <span class="hljs-attr">e</span>: [] }
g.o = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">x</span>) </span>{ g.e.push(...[<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>]) }
g.o()</code></pre><br />
Код выглядит так, отличаются только биндинги.<br />
<br />
<div style="text-align:center;"></div><br />
Результат неожиданный, но железно воспроизводимый. <code>var</code>, быстрее.<br />
<br />
<h2>
<font color="#3AC1EF">Bounce pattern, Switch case, длинная тернарка</font>
</h2><br />
Если обе конструкции логически одинаковые, они должны строить одно и то же синтаксическое дерево, верно? Давайте проверим.<br />
<br />
<pre><code class="javascript hljs"><span class="hljs-comment">// switch case</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">thing</span>(<span class="hljs-params">e</span>) </span>{
<span class="hljs-keyword">switch</span> (e) {
<span class="hljs-keyword">case</span> <span class="hljs-number">0</span>:
<span class="hljs-keyword">return</span> <span class="hljs-string">"0"</span>;
<span class="hljs-keyword">case</span> <span class="hljs-number">1</span>:
<span class="hljs-keyword">return</span> <span class="hljs-string">"1"</span>;
<span class="hljs-keyword">case</span> <span class="hljs-number">2</span>:
<span class="hljs-keyword">return</span> <span class="hljs-string">"2"</span>;
<span class="hljs-keyword">case</span> <span class="hljs-number">3</span>:
<span class="hljs-keyword">return</span> <span class="hljs-string">"3"</span>;
<span class="hljs-keyword">default</span>:
<span class="hljs-keyword">return</span> <span class="hljs-string">""</span>;
}
}
<span class="hljs-comment">// bounce pattern</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">bounce</span>(<span class="hljs-params">x</span>)
</span>{
<span class="hljs-keyword">if</span> (x === <span class="hljs-number">0</span>) <span class="hljs-keyword">return</span> <span class="hljs-string">"0"</span>;
<span class="hljs-keyword">if</span> (x === <span class="hljs-number">1</span>) <span class="hljs-keyword">return</span> <span class="hljs-string">"1"</span>;
<span class="hljs-keyword">if</span> (x === <span class="hljs-number">2</span>) <span class="hljs-keyword">return</span> <span class="hljs-string">"2"</span>;
<span class="hljs-keyword">if</span> (x === <span class="hljs-number">3</span>) <span class="hljs-keyword">return</span> <span class="hljs-string">"3"</span>;
<span class="hljs-keyword">return</span> <span class="hljs-string">""</span>
}
<span class="hljs-comment">// ternary</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">bounce</span>(<span class="hljs-params">x</span>) </span>{
<span class="hljs-keyword">return</span> <span class="hljs-number">0</span> === x ? <span class="hljs-string">"0"</span> : <span class="hljs-number">1</span> === x ? <span class="hljs-string">"1"</span> : <span class="hljs-number">2</span> === x ? <span class="hljs-string">"2"</span> : <span class="hljs-number">3</span> === x ? <span class="hljs-string">"3"</span> : <span class="hljs-string">""</span>;
}</code></pre><br />
Вот так выглядит код. Для всех вариантов он одинаков, отличаются только вызовы.<br />
<br />
<h3>
<font color="#3AC1EF">▍ 1. Вызов в цикле</font>
</h3><br />
<pre><code class="javascript hljs"><span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> t = <span class="hljs-number">0</span>; <span class="hljs-number">1e5</span> &gt; t; t++) bounce(<span class="hljs-number">0</span>), bounce(<span class="hljs-number">2</span>), bounce(<span class="hljs-number">6</span>);</code></pre><br />
Вызов выглядит так. <a href="https://www.measurethat.net/Benchmarks/Show/22099/0/no-type-coercion-switch-case-vs-bounce-pattern-vs-terna">Линк</a>.<br />
<br />
<div style="text-align:center;"></div><br />
<h3>
<font color="#3AC1EF">▍ 2. В цикле с другим типом</font>
</h3><br />
<pre><code class="javascript hljs"><span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> t = <span class="hljs-number">0</span>; <span class="hljs-number">1e5</span> &gt; t; t++) bounce(<span class="hljs-string">"0"</span>), bounce(<span class="hljs-string">"2"</span>), bounce(<span class="hljs-string">""</span>);</code></pre><br />
Тут мы покидываем строку вместо числа. В свитче и <code>if</code> блоках используется строгое равенство, поэтому свитч выходит только через <code>default</code>, а <code>if</code>’ы выходят только последний <code>return</code>. <a href="https://www.measurethat.net/Benchmarks/Show/22098/0/type-coercion-switch-case-vs-bounce-pattern-vs-ternary">Линк</a>.<br />
<br />
<div style="text-align:center;"></div><br />
<h3>
<font color="#3AC1EF">▍ 3. Без цикла</font>
</h3><br />
<pre><code class="javascript hljs">bounce(<span class="hljs-number">0</span>), bounce(<span class="hljs-number">2</span>), bounce(<span class="hljs-number">6</span>)</code></pre><br />
Просто три вызова подряд, никаких циклов. <a href="https://www.measurethat.net/Benchmarks/Show/22100/0/no-loop-switch-case-vs-bounce-pattern-vs-ternary">Линк</a>.<br />
<br />
<div style="text-align:center;"></div><br />
Похоже, что после первоначальной компиляции лиса не пытается дальше оптимизировать цикл, как это делает хром.<br />
<br />
Также лиса, похоже, не строит одно и то же AST, как это делает хром. Рекомендую заменить ваши длинные <code>if</code>’ы и bounce паттерны на свитчи, чтобы избежать лисиных тормозов.<br />
<br />
<h2>
<font color="#3AC1EF">Инициализация массива</font>
</h2><br />
Для примера возьму из паттернов функционального программирования, когда ты инициализируешь массив, прокидывая лямбду в инициализатор. Просто ради примера, в качестве этой лямбды будет fizzbuzz.<br />
<br />
<pre><code class="javascript hljs"><span class="hljs-keyword">var</span> times = <span class="hljs-number">65535</span>;
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">initializer</span>(<span class="hljs-params">val, z</span>) </span>{
<span class="hljs-keyword">const</span> i = z % <span class="hljs-number">5</span> | <span class="hljs-number">0</span>;
<span class="hljs-keyword">return</span> <span class="hljs-number">0</span> == (z % <span class="hljs-number">3</span> | <span class="hljs-number">0</span>) ? <span class="hljs-number">0</span> === i ? <span class="hljs-string">"fizzbuzz"</span> : <span class="hljs-string">"fizz"</span> : <span class="hljs-number">0</span> === i ? <span class="hljs-string">"buzz"</span> : z;
}
<span class="hljs-comment">// for i</span>
<span class="hljs-keyword">var</span> b = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Array</span>(times);
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; times; i++) {
b[i] = initializer(b[i], i)
}
b
<span class="hljs-comment">// for push</span>
<span class="hljs-keyword">var</span> c = [];
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; times; i++) {
c.push(initializer(c[i], i))
}
c
<span class="hljs-comment">// Fill Map</span>
<span class="hljs-keyword">new</span> <span class="hljs-built_in">Array</span>(times).fill().map(initializer)
</code></pre><br />
Это не самый красивый fizzbuzz, но это мой fizzbuzz. <a href="https://www.measurethat.net/Benchmarks/Show/22086/0/array-initialization-for-for-push-fill-map">Линк на бенч</a>.<br />
<br />
<div style="text-align:center;"></div><br />
Вариант с <code>fill map</code> создаёт два массива, сначала при вызове конструктора, потом при вызове map. Но такой вариант безальтернативно быстрее на хроме.<br />
<br />
<h2>
<font color="#3AC1EF">Конкатенация массивов</font>
</h2><br />
<div style="text-align:center;"></div><br />
<pre><code class="javascript hljs"><span class="hljs-comment">// reduce</span>
arr.reduce(<span class="hljs-function">(<span class="hljs-params">acc, val</span>) =&gt;</span> acc.concat(val), [])
<span class="hljs-comment">// flatMap</span>
arr.flatMap(<span class="hljs-function"><span class="hljs-params">x</span> =&gt;</span> x)
<span class="hljs-comment">// flat</span>
arr.flat()
<span class="hljs-comment">// reduce push</span>
arr.reduce(<span class="hljs-function">(<span class="hljs-params">acc, val</span>) =&gt;</span> {
<span class="hljs-keyword">if</span> (val) val.forEach(<span class="hljs-function"><span class="hljs-params">a</span> =&gt;</span> acc.push(a));
<span class="hljs-keyword">return</span> acc;
}, [])
<span class="hljs-comment">// forEach push</span>
<span class="hljs-keyword">let</span> acc = [];
arr.forEach(<span class="hljs-function"><span class="hljs-params">val</span> =&gt;</span> {
val &amp;&amp; val.forEach(<span class="hljs-function"><span class="hljs-params">v</span> =&gt;</span> acc.push(v));
}), acc;
<span class="hljs-comment">//concat spread</span>
[].concat(...arr)
</code></pre><br />
Конкатенация массивов на 1 уровень, поведение идентичное <code>flat(1)</code>. <a href="https://www.measurethat.net/Benchmarks/Show/22085/0/flat-vs-flatmap-vs-reduce-vs-reduce-push-vs-foreach-pus">Линк</a>.<br />
<br />
<div style="text-align:center;"></div><br />
Иногда я не понимаю, почему разработчики движков оставили такой потенциал для оптимизации.<br />
<br />
<h2>
<font color="#3AC1EF">Уничтожение хрома</font>
</h2><br />
Бенчмарки ниже я перепроверял по нескольку раз, результат одинаковый и верный. Лиса действительно такая быстрая.<br />
<br />
<h3>
<font color="#3AC1EF">▍ Итерация по массиву</font>
</h3><br />
Сравнивать будем <code>Array.prototype.forEach vs for...of vs for</code>. На код смотрите <a href="https://www.measurethat.net/Benchmarks/Show/22095/0/side-effect-for-i-vs-for-of-vs-foreach-fix">по линку</a>.<br />
<br />
<div style="text-align:center;"></div><br />
Ради производительности, циклы <code>for</code>, лучше переделать в <code>forEach</code>, чтобы хром не отставал.<br />
<br />
<h3>
<font color="#3AC1EF">▍ Содержит ли строка значение</font>
</h3><br />
<pre><code class="javascript hljs"><span class="hljs-comment">// text.includes()</span>
url.includes(<span class="hljs-string">'matchthis'</span>)
<span class="hljs-comment">// text.test()</span>
/matchthis/.test(url)
<span class="hljs-comment">// text.match()</span>
url.match(<span class="hljs-regexp">/matchthis/</span>).length &gt;= <span class="hljs-number">0</span>
<span class="hljs-comment">// text.indexOf()</span>
url.indexOf(<span class="hljs-string">'matchthis'</span>) &gt;= <span class="hljs-number">0</span>
<span class="hljs-comment">// text.search()</span>
url.search(<span class="hljs-string">'matchthis'</span>) &gt;= <span class="hljs-number">0</span>
</code></pre><br />
<br />
<div style="text-align:center;"></div><br />
Трюк с <code>IndexOf</code> быстрее и на лисе, и на хроме. Используйте трюк с <code>IndexOf</code>. <a href="https://www.measurethat.net/Benchmarks/Show/22090/0/includes-vs-test-vs-match-vs-indexof-vs-search-fix">Линк на бенчмарк</a>.<br />
<br />
<h2>
<font color="#3AC1EF">Преобразование строки в число</font>
</h2><br />
Тестируем неявное преобразование, парсинг и вызов конструктора.<br />
<br />
<pre><code class="javascript hljs"><span class="hljs-comment">// implicit</span>
<span class="hljs-keyword">var</span> imp = + strNum
<span class="hljs-comment">// parseFloat</span>
<span class="hljs-keyword">var</span> toStr = <span class="hljs-built_in">parseFloat</span>(strNum)
<span class="hljs-comment">//Number</span>
<span class="hljs-keyword">var</span> num = <span class="hljs-built_in">Number</span>(strNum)
</code></pre><br />
<h3>
<font color="#3AC1EF">▍ Int</font>
</h3><br />
<br />
<div style="text-align:center;"></div><br />
<a href="https://www.measurethat.net/Benchmarks/Show/21897/0/implicit-vs-parseint-vs-number-string-to-num">Линк на бенч</a>.<br />
<br />
<h3>
<font color="#3AC1EF">▍ Float</font>
</h3><br />
<br />
<div style="text-align:center;"></div><br />
Я перепроверял, это не ошибка. Неявный каст стринги в инт практически бесплатный у лисы. <a href="https://www.measurethat.net/Benchmarks/Show/22092/0/implicit-vs-parsefloat-vs-number-string-to-num">Линк на бенч</a>.<br />
<br />
<h2>
<font color="#3AC1EF">Выводы</font>
</h2><br />
<ol>
<li>Лисичка похорошела.
</li>
<li>JS сделан за неделю на коленке.
</li>
<li>Я не пишу на JS.
</li>
<li>Вы тоже прекращайте.
</li>
</ol><br />
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Простой
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#complexity-low"></use></svg></span> <span class="tm-article-complexity__label">Простой</span>
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Просмотры
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Всего голосов 51: ↑46 и ↓5
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-rating"></use></svg> <span title="Всего голосов 51: ↑46 и ↓5" class="tm-votes-meter__value tm-votes-meter__value tm-votes-meter__value_positive tm-votes-meter__value_appearance-article tm-votes-meter__value_rating">+41</span>
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Добавить в закладки
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-favorite"></use></svg></span> <span title="Количество пользователей, добавивших публикацию в закладки" class="bookmarks-button__counter">54</span></button>
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Комментарии
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-comments"></use></svg> <span class="tm-article-comments-counter-link__value">68</span></a> <a href="/ru/company/ruvds/blog/714946/comments/" class="tm-article-comments-counter-link__link"><span title="Читать новые комментарии" class="tm-article-comments-counter-link__unread-counter">+68</span></a>
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Простой
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#complexity-low"></use></svg></span> <span class="tm-article-complexity__label">Простой</span>
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Время прочтения
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#clock"></use></svg></span> <span class="tm-article-reading-time__label">6 мин</span>
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Просмотры
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Всего голосов 41: ↑37 и ↓4
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Добавить в закладки
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Комментарии
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-comments"></use></svg> <span class="tm-article-comments-counter-link__value">43</span></a> <a href="/ru/post/715950/comments/" class="tm-article-comments-counter-link__link"><span title="Читать новые комментарии" class="tm-article-comments-counter-link__unread-counter">+43</span></a>
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Время прочтения
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#clock"></use></svg></span> <span class="tm-article-reading-time__label">8 мин</span>
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Просмотры
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Всего голосов 35: ↑33 и ↓2
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Добавить в закладки
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Комментарии
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-comments"></use></svg> <span class="tm-article-comments-counter-link__value">10</span></a> <a href="/ru/post/715872/comments/" class="tm-article-comments-counter-link__link"><span title="Читать новые комментарии" class="tm-article-comments-counter-link__unread-counter">+10</span></a>
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<title>
Средний
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#complexity-medium"></use></svg></span> <span class="tm-article-complexity__label">Средний</span>
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Время прочтения
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#clock"></use></svg></span> <span class="tm-article-reading-time__label">7 мин</span>
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Просмотры
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Всего голосов 28: ↑28 и ↓0
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-rating"></use></svg> <span title="Всего голосов 28: ↑28 и ↓0" class="tm-votes-meter__value tm-votes-meter__value tm-votes-meter__value_positive tm-votes-meter__value_appearance-article tm-votes-meter__value_rating">+28</span>
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<title>
Добавить в закладки
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-favorite"></use></svg></span> <span title="Количество пользователей, добавивших публикацию в закладки" class="bookmarks-button__counter">28</span></button>
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Комментарии
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<use xlink:href="/img/megazord-v28.78dd0d98..svg#counter-comments"></use></svg> <span class="tm-article-comments-counter-link__value">0</span></a> <!---->
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<span class="tm-user-info tm-article-snippet__author"><a href="/ru/users/seasadm/" class="tm-user-info__userpic" title="seasadm">
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</div></a> <span class="tm-user-info__user"><a href="/ru/users/seasadm/" class="tm-user-info__username">seasadm <!----></a> <span class="tm-article-snippet__datetime-published"><time datetime="2023-02-09T11:02:04.000Z" title="2023-02-09, 19:02">22 часа назад</time></span></span></span>
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Сложный
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1130 человек
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<a href="https://ruvds.com/ru-rub/data" rel="nofollow noreferrer" target="_blank" class="tm-widget-links__link">Дата-центры RUVDS в Москве, Санкт-Петербурге, Казани, Екатеринбурге, Новосибирске, Лондоне, Франкфурте, Цюрихе, Амстердаме</a> <small class="tm-widget-links__host">ruvds.com</small>
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<a href="https://ruvds.com/vps_start" rel="nofollow noreferrer" target="_blank" class="tm-widget-links__link">VPS (CPU 1x2ГГц, RAM 512Mb, SSD 10 Gb) — 190 рублей в месяц</a> <small class="tm-widget-links__host">ruvds.com</small>
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<a href="https://ruvds.com/ru-rub/data/eng" rel="nofollow noreferrer" target="_blank" class="tm-widget-links__link">VPS в Лондоне. Дата-центр TIER III — английская точность за рубли.</a> <small class="tm-widget-links__host">ruvds.com</small>
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<a href="https://ruvds.com/ru-rub/" rel="nofollow noreferrer" target="_blank" class="tm-widget-links__link">VPS с видеокартой на мощных серверах 3,4ГГц</a> <small class="tm-widget-links__host">ruvds.com</small>
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RUVDS Client
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Приложение для мониторинга и управления виртуальными серверами RUVDS с мобильных устройств.
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