When you deactivate Swift plugin, and uncheck all boxes it will remove everything from database when you deactivate Swift and uninstall it.
Depends on the size of your site. The default should be fine but can go up to 256 MB or even 512MB to 1GB if site is bloated.
Check here for detailed steps to perform: https://kb.freelancerstools.com/knowledge-base/wordpress-system-errors/#fatal-error-allowed-memory-size-exhausted-error If set_time_limit is disabled on your server, or you are using reverse proxy (Nginx + Apache) and there is a short proxy read timeout, ...
Not exactly. This shows how long can PHP script run. It is possible that max_execution_time is longer, but there is proxy timeout which stops the script earlier. It will be also 40s if the server doesn’t serve multiple threads for the same IP.
300 is the default timeout, however Swift will try to extend it up to 600s during autoconfig. If it is above or equal 40s it is ok, however higher timeout can speed up prebuild process.
It should be fixed easily if you add the following line to the top of your wp-config.php: define("SWIFT_PERFORMANCE_DISABLE_SET_TIME_LIMIT", true);
It could be various reasons for this issue but 1st check if you have overlapping of Swift’s lazy load feature with other plugins/your theme’s lazy load feature, e.g. lazy load of cloudinary.com.
You can upgrade your Swift license at any time after initial purchase and you only need to pay the difference. For Swift's license upgrade you must login to your Swift’s account on Swift’s website https://swiftperformance.io/my-account/, you will find the Upgrade options next to your subscripti...
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The Warmup Table might be broken. You should update to latest Swift's version (if you are using an earlier version) or if you are using the latest version you should 1st disable Swift, don’t keep Warmup Table (Swift will ask you to keep some things and you untick a Warmup Table option) and reactivat...