Lag/Spike/IDK

So whenever i load valorant it loads perfectly but once im in, it stutters? like it lags or spikes then it works for a few seconds then lags/spikes for a few seconds and works again. This happens over and over, the fps says 300-400 and the network is 20 average. Anyone know any solutions? This also makes my pc stutter on google/chrome/roblox/discord/etc unless i restart my pc if i run valorant.