I would use proton drive more if it wasn't so slow, unfortunately the speed and the features lacking are preventing me from switching from Google photos
I think it's a bit harsh to compare a service like Proton which operates data centers in Norway, Switzerland, and Germany. Google is known for its extensive and highly optimized global network, its infrastructure has probably the largest (PoPs) points of presence in the world - latency issues with Proton is the trade-off you get when you choose privacy over corporate data theft.
I mean... It's true but that doesn't excuse everything taking up to several seconds to load in. It's a performance problem not a latency one. And nothing is preventing them from building CDN servers in North America for faster latency
Have you looked into Ente? It's E2EE as well, open source, and has much better rendering times. While I'm all in with a Visionary plan on Proton, I mainly use the photos option as a secondary archive, Ente is my daily driver for photo sharing and viewing. Might be worth a look if you're serious about ditching Google