If you have premiumize or real debrid or some service like that. You can try jdownloader. It usually speed up downloads.
Just have to set up your account. It might take you a minute to figure it out.
And I’ve read you might get better performance setting protocol manually in SS instead of leaving it on automatic. Though for me, I’m not having any problems so automatic it is.
I think the setting may depend on your ISP and what their infrastructure is like. After extensive testing and setup I found my setup worked best with Wireguard UDP. This is just one of those things that relys on ppl doing their own testing to find the “Sweet Spot”.