I use ProtonVPN all the time on my cell phone and don't have any issues with it.
One thing that you can do is to route through two different sites to obscure the path a bit more. My cell phone, for example, currently is configured with entrance and exit points in the US and in Iceland.
On two occasions just for fun, I was on a computer in my office and connecting via ssh to a computer in the computer room across the hall. Instead of just connecting directly, I had it route my connection through Stockholm, Sweden and Tokyo, Japan. The first time I did this, I was surprised at the speed I was getting. The second time, it was noticeably slower.
For what it's worth, I have a Proton Visionary Plan which includes all their products and enhanced support. They are the best e-mail out there. Also, my storage space is 5.6 terabytes.
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