2 Similar sites – 2 different P3 results ???

Hello,

I used P3 for 2 different wp-sites. The 2 sites are nearly the same on the same server (NOT PHP 7) and they use nearly the same plugins.

on the following screenshots you can see the 2 P3-results

the plugins, which you see in the right one (for example beaver), are also active in the left one, but they are not shown in the left diagram ??

but the plugins are loaded.

The left wp-installation needs 2 seconds to load. the right one needs 6 seconds, and I can not understand, why ?? (The left one has 4 active plugins more)

both websites are without cache or other speed-optimizer

its not so important to get the right P3 result,
but I need to find the reason, why the right one is so slow.

can anybody help ?

Thanks