Uh, it's actually a thing and I do not worry about it. But, you can use attachments to try and solve this problem.

it seems pretty common, I'm having the same issue. specific weapon attachments don't help either it is very slow and problematic. id have good weapon handling but it remains just as slow, does anyone know how to fix it?

Yeah I noticed that too, the guns feel slower than they used to. Guns with high handling don't feel much faster than their base version.

Even with ADS modifier at .25 they still feel slow.

the ads speeds are fixed when in a multiplayer game, not singleplayer