Performance

Baseline: main 23.0+ · Verified: main 26.800.0

Caching itself: bitrix-caching. SQL profiling: bitrix-database (SqlTracker). Sessions: bitrix-sessions.

Composite

Static HTML of the page is served from the composite cache (NGINX can serve it directly); dynamic areas are fetched by a follow-up request. Enable in Settings → Composite site. Kernel: Bitrix\Main\Composite\Engine, Page, StaticArea, BufferArea.

In a component template ($this is CBitrixComponentTemplate):

$this->setFrameMode(true);                 // template is composite-compatible

$frame = $this->createFrame()->begin('Loading…');  // stub shown in the cached HTML
echo htmlspecialcharsbx($arResult['USER_NAME']);   // dynamic content
$frame->end();