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Great question. As explained in the plugin documentation (under “Caching Plugins”), page caching prevents dynamic plugins like Blackhole from working properly. When page cache is enabled, required WP hooks are not fired for each page load (because the page content is cached), so Blackhole cannot check incoming requests, block, etc. Thus, if your site uses any sort of page caching, do not use dynamic plugins like Blackhole.
I hope this helps, let me know if I can provide any further information.
Ok,
So I have to choose to either use Blackhole or have Page Caching. But disabling Page Caching would slow my website’s speed, wouldn’t it?
best,
Ps. Thanks for the quick response!