The only reason they did the tweak was to improve the performance test results, showing that even though you had their AV installed your read/write speed would not be decreased. But in any case that would mean that their detection scores would have gone down?
Just taking an educated guess here and anyone is more than welcome to correct me. This is for Baidu. Personally I do not know how THEY (AV testing groups) do the test but looking at these results, real world protection is suffering a lot while file detection is not. Maybe they test detection by scanning files (right click/contextual scan) and not running them/moving them and having real time pick it up. In this case, the performance would stay high while detection would also remain high. For all I know they tell you on their sites how they do it and I'm just too lazy to read it.
But anyway, if this is the cause, and they do download the AV from the site like any regular user, one could test my theory. I'd personally not do it unless in a virtual machine. I've tested Baidu before and did not have a fun time with removing it.
Also I have to wonder if maybe someone else already thought like myself. I can't be the first to come up with that. I feel like it's too simple...
