For DW20, I installed Fastcraft, disabled journeymaps and enabled opis (or any minimap mod other than journeymap)Ok, still at it. Still no luck making the new packs playable. Anything running 1.7.10 is a no go. My first post I was running windows, so here is the same computer running Linux Mint 17 with all the updated drivers. As you can see my frame rate is bad (this was one of the high points, it mostly sits around 3-5 fps)
And, I cleaned the P.C. out 1 week ago. It also now is overclocked to 3.6GHz.
This is a screenshot of the latest Resurrection pack. But the lag in Direwolf20 is almost as bad, but can be playable at times.
Also disabled both aromacore and aromabackup.
I did all these and my framerates jumped.
Also try Java 8 update 25, 64 bit of course and allocate the usual amount of memory to it (2-4GB). My computer is an i3 and 4GB of RAM and now getting about 40-50fps in DW20, no reason yours couldn't