Random lag spikes

[Aerozord]

First the issue. I suddenly get massive lag spikes, especially when playing modded minecraft (I previously played it fine) and am trying to eliminate possibilities. The confusing thing is it is intermittent. Suddenly I start getting alot of lag, I suspect its not just minecraft as I have moments in TF2 when I simply cant do anything. The game keeps playing, I can see the other players acting I just cant move so I dont think its internet related. The lag is also independent of what I am doing. I can have several entites active with no issue, but get lag while dragging stuff in my inventory.

A few possible causes.
-The modpack updated
-I navigated some questionable websites while my security wasn't at its best

Both I am iffy on. If it was minecraft being more taxing than there shouldn't be sudden lag spikes. Viruses I also know are usually designed to be low-key to avoid detection plus I ran multiple scans and it came up clean.

Any thoughts or suggestions?