Bloodhound ult & Octane's Speed Boost Fps Drop + Input Delay

I have a Gtx 1080 , I7 7700K , 16gb RAM Dual Channel @ 2900mhz

Latest windows updates , latest nvidia drivers , disabled xbox dvr and all game related windows things

The game runs at a smooth 144fps/144hz solid , gpu temps are at around 60-65C , gpu usage seems to not be constant

When i use Bloodhoud Ult i drop to like 110-120fps and GPU usage goes to 98-99% , and i experience huge input delays , its like im draging my mouse trough mud , everything is delayed , each mouse movement , each click is obviously delayed. I dont understand why this happens , im still at 120 fps , the game should run fine , but this input lag is horrible.

The same thing happens when there are big fights , if im in a middle of a big 3-4 squad fights where everything is chaotic my fps might drop to 110 and this is fine , but again my gpu usage goes high to 99% and im experiencing huge input lag , its really bad and noticeble even tho my fps is fine.

I dont think the fps is the problem , i played Battlefield 5 maxed out and i was getting 90-100 fps in the chaotic fights and i was having 0 input delay , it felt very crisp and nice.

My sensitivity dosent feel this crisp in this game even tho im getting way higher fps and the huge input lag spikes are really hurting my aiming.

Could anyone help me fix this issue ?

Thank you.

edit : i have a freshly installed windows since 1 week but this issue still happens