Massive slowdown in latest versions of Dolphin

[Blob55]

A few days ago my Dolphin was playing fine and I had almost no slowdown at all. I was using 3.5-1226 x64. Now I'm getting huge slowdowns in all the games I play, especially Sonic ones. I'm now using 3.5-1251 x64. I'm wondering if anything major happened to the Dolphin to make these slowdowns happen?

My Computers specs are:
Windows 7
Intel Core i7-2600 3.40 GHz
NVIDIA GeForce GT 545
8.00 GB

[ExtremeDude2]

Check your temps

[slax65]

Check your temps

Nonsense .. It's the same for me ..

[Blob55]

Temp 1 and Cores 0-3 were all between 52-58C, my GPU is its usual temp of 53-57C, Local and Temp 2 are 31-33C and HD0 is mid 20C.
A few days ago the temp outside has got a bit warmer, but I didn't think it'd make that much of a difference. O_o

[skid]

Do you have progressive scan enabled in the Graphics > Advanced settings? If so, disable it.

[Blob55]

I don't have anything enabled in Advance.

[Blob55]

Also, I can't seem to play anything without using Direct3D9 and even then I get some slowdown.

[rpglord]

Well obviously try again with 3.5-1226 x64 and see if you get these slowdowns.
If not, track the exact revision which causes slowdowns it's easier for devs to fix when they know exactly which revision is the problem.
If you still have problems with 3.5-1226 x64 and it was working fine, then problem is somewhere in your computer, not dolphin.

[skid]

Does going back to 3.5-1226 make things go back to normal speed?

[Blob55]

Sonic Unleashed runs at about 92% on Direct3D11 on 1226, while it runs at 88% on Direct3D9 on 1251.