Not really. Guest caching works by caching the output HTML in its entirety. You could disable guest caching completely on pages with the widget by setting:
PHP:
\XF\Pub\App::$allowPageCache = false;
Alternatively, I suppose you might be able to load the widget content via AJAX.
Not really. Guest caching works by caching the output HTML in its entirety. You could disable guest caching completely on pages with the widget by setting: