The only thing you can really do is just reduce view distance if you've done everything else. Make sure antialiasing is off in-game, and make sure that Catalyst isn't forcing it or something. Other than that? Try dropping view distance. I have to drop mine to 6 to get more than 25 fps reliably, and I'm running a rig with similar power and 8GB RAM.
Unfortunately, actually playing with SEUS is impractical because I'd rather have ugly 180+ fps than gorgeous 25+ fps, but it runs just fine for taking pictures and stuff. Not surprised it runs poorly compared to other games; this is an amateur mod for a game that has terrible coding to begin with
Installing SEUS Mod is absolutely hassle-free. The installation process does not require any special knowledge but it is simply a step-by-step procedure that is completed by a few button clicks. readmore befor fix: file-minecraft[.]com/sonic-ethers-unbelievable-shaders-mod/