Hi @kaasconnaisseur ,
Easy way to improve your site speed is fix the 404 errors which are wasted requests. The fewer the requests the better is the name of the game for site speed 
. See screenshot below.
Also it seems you are not using lazy loading for your images and videos. Consider doing so, we have a video tutorial on lazyloading videos here https://www.youtube.com/watch?v=LxzdCCiWwSs&t=11s
Best,
eStoreSpeedOptimization