7. Производительность

&lt;br&gt;&lt;br&gt; &lt;div style=&quot;text-align:right&quot;&gt;&lt;b&gt;&lt;a href=&quot;/upload/academy-docs/kurs_dev_material/n3/k3_les7.zip&quot;&gt;Скачать задание и материалы к уроку&lt;/a&gt;&lt;/b&gt;&lt;/div&gt; &lt;p&gt;&lt;b&gt;Введение&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/SNrJ0ersuaA&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239674&hash=9689b32656057983&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Монитор производительности&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/z8eEJ-4mdsQ&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239675&hash=075bd1014e7df353&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Запросы в цикле&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/UYrtNbt4Kcw&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239676&hash=8c6b1e9bffa815ec&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Обмен большим объемом данных на хитах&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/0TBn0IXGwgg&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239677&hash=3c7e14ae30bcf473&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Медленные области в шаблоне&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/0Vn_j6N8ZZs&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239678&hash=75b909cab0cbd2c2&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Параметр INCLUDE_SUBSECTIONS&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/6JfFVJ_mzSc&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239679&hash=717f5b1033b6a606&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Группировка в GetList&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/dlybyjPGOiI&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239680&hash=7823d893ae7565ec&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Сортировка в GetList&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/a8sbWG8D_ao&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239681&hash=977ff58c99b8af0c&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Большое количество свойств&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/E73bGgR_4B0&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239682&hash=eb774f5fac065222&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;null в значениях фильтра&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/YEaHJAMhXbw&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239683&hash=ab18f6836f5b231c&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Избыточные данные&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/kbTx2rD_r2Y&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239684&hash=a9ce1191fa363801&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Отключено кеширование&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/Ywz_91AZsTg&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239685&hash=dcddefad257beb4f&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Большой объем файла кеша&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/ok9g57HQXfo&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239686&hash=f321afae129e63f7&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Большое количество файлов&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/_QFtscIIASk&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239687&hash=8ddb397ed0db262c&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Управляемый кеш компонентов при частом сбросе информации&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/eA-Gg9VMbGs&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239688&hash=29b52efc4023a13b&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt; &lt;br&gt;&lt;br&gt; &lt;p class=&quot;less-part-name&quot;&gt;&lt;b&gt;Индексы в БД&lt;/b&gt;&lt;/p&gt; &lt;!--&lt;iframe width=&quot;560&quot; height=&quot;315&quot; src=&quot;https://www.youtube.com/embed/-tMY_Fs4NKk&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; --&gt; &lt;iframe src=&quot;https://vk.com/video_ext.php?oid=-211967493&id=456239689&hash=a958b173500002f7&hd=2&quot; width=&quot;560&quot; height=&quot;315&quot; allow=&quot;autoplay; encrypted-media; fullscreen; picture-in-picture;&quot; frameborder=&quot;0&quot; allowfullscreen&gt;&lt;/iframe&gt; &lt;br&gt;&lt;br&gt;