I guess you can't have it all without a big price tag. I found some posts, an older one talking about vultr previously providing 3.4GHz cores, then down to 2.4Ghz and a newer 2018 post states 2.6GHz...
I don't know if you're using more than 1 CPU (1 core, VPS providers make it confusing) but this site talks about the issues with MT4 being an older 32 bit program and not being efficient on multiple cores. I also don't know how the back end of fxdreema works but it may be of use to you if you're using an MT4 compiler...