pcsx2 on ubuntu 18.04 intel graphics driver

In Linux, I can only play around 30 minutes with a GPU temperature up to 90C and CPU temps of 80C, in Windows I can play up to an hour with a cooler and more quiet fan (I checked throttlestop and it says 72C of CPU temp). For example, I play NBA 2K14 using Lutris on battery (I'm broke so I can't afford to buy any games). Why does Linux consume more power and produce more heat when gaming compared to Windows? I really want to play games in Linux but it heats up more and faster.

I'm very tempted to just install Mint on my Deck instead, with Steam only existing for the sake of the controller. What exactly could be causing this, and how could I work around it? I don't really want to use Steam itself, as I don't like my games being forced to run through specific ecosystems or proprietary software. I also have issues with using custom DLL files (namely dinput8) - even with WINEDLLOVERRIDES, I cannot get the games on SteamOS to pick them up, but it works fine on Mint. I first theorised that it could be because SteamOS was using the flatpak version of Lutris, so I installed the Lutris package independent of Flatpak through pacman, but that does not seem to have solved any issues. However, when doing the same on SteamOS (on the Steam Deck), no matter what I do, I can't seem to get the video files working in game. On my desktop PC using Mint, installing Darksiders Warmastered Edition with the mfplat.dll allows all the video files to play flawlessly with no issues.

I'm a linux newbie - I've only just started using Linux full-time, so I'm not entirely sure what could be causing this.

Pcsx2 on ubuntu 18.04 intel graphics driver