Crazy Modern Warfare Lag Spikes

[DrCanada]

I have recently started playing mw again on PC and have found that I experience crazy lag spikes while in a game. I have tried things like turning down graphic settings that were very CPU heavy, running the program as an administrator, turning off the discord and nvidia overlay, turning off nvidia highlights and i have downloaded process lasso to set the CPU usage priority of the game to normal however they keep apearing. I am currently playing using a wireless wifi adapter (https://www.amazon.ca/-/fr/BrosTrend-Linux-Adaptateur-ordinateur-Raspberry/dp/B07FCN6WGX/ref=sr_1_4?__mk_fr_CA=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=3IFZ06U5HSAXQ&keywords=brostrend+wifi+adapter&qid=1586624484&sprefix=brostrend+wifi%2Caps%2C271&sr=8-4). My whole family is home all day due to quarantine so maybe its because they use wifi too? I am maybe 10-15m from the router. What is the cause of this? How do i fix it?