I notice fastcraft hasn't updated to 1.10 yet but it can be hard for me to play heavily modded instances without some kind of break. As it is now my CPU is constantly capping out at 100% when it used to only spike up there on initial world load and it would even out to 80-85% or so, with mods I could get it down to 60%.
I have nothing against optifine but I tried it and the lag was real. It never used to do that either, I could run the game fine on 1.7.10 but on 1.10.2 the resource load is pretty extreme and I feel really uncomfortable having my CPU constantly in the 90s and frequently capping at 100%. Plus a lot of mods don't work well with optifine and every mod author and their brother has basically denied support to anyone running it because it's too difficult to diagnose problems with it due to its own mod author not releasing documentation on how it works.
I can't really afford to run my CPU into the ground right now. :/ it's an older model AMD (5 years now) and replacing it with another processor means getting a new motherboard as well at this point.
I've heard of foamfix but apparently it only deals with RAM. My RAM usage isn't a problem, my core resources are though.
That actually did help a tiny bit, still need to close my browser and al redundant programs when playing but it did reduce the load by about 3 gigs on my RAM and the CPU usage is still high, but it caps out a lot less frequently and doesn't go above the 80s during world exploration on singleplayer, it also actuall drops pretty low when idle in-game or in a central location with not much going on whereas before it would never idle below 60 and stay usually above the 75 mark.
It's not the best and the game still ran better on 1.7.10 but it's playable now, it'll probably run a little better for me on a server when the game doesn't need to boot a localhosted instance along with my game.
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If you say "plz" because it's shorter than "Please," I'll say "No" because it's shorter than "Yes."