Ok, I tried:
Points 1.1 to 1.3 are not valid for my site, as they are not “usual” search forms.
Point 1.4, cache, made it even slower.
Custom handler made no difference
Image crop was disabled already
Etc…
So basically almost every point in my settings was as that tutorial tells me to do. And the plugin performed great before, like…2/3 seconds to drop results. But now…from 7 to 12 seconds.
The only thing I did not try is the Index Table, but I can’t see a reason to use this on my site.
Can you help me please?
Thanks.