Plugin times are always the same

I was testing some plugins using Plugin Profiler and the result was not was I expected.

All three different plugins out of 20 measured same when plugin-only was compared to without plugin and all plugins. E.g. WordPress SEO measured:

– Only WordPress SEO 0.202s
– All but WordPress SEO 0.198s
– All plugins 0.186s

Advanced cache and opcode cache was disabled.

To me the numbers seem to be off, because “All plugins” should be about “Only…”+”All but…”.

Am I missing something?

https://wordpress.org/plugins/plugin-profiler/