Open the task manager on your laptop, then start playing Minecraft until it has bad performance. Then minimize it and open task manager's processes tab. Sort them by user name and screenshot it. Upload the screenshot to www.imageshack.us and make sure to select option "Do not resize". Post the link to it here.
Also it may have something to do with copying the .minecraft folder.
Just make a back up of your saves and select force update the next time you log in, see how it works and then reinstall opifine again, because obviously you were not using the multicore version before.
Ok I did that and yes, suprisingly simular resolutions. The pentium system is running at 1360x768(TV) and the laptop is at 1366x768. Weird that they're only 6 pixels off lol.
I just can't understand why it runs better on an old ass box vs a new laptop. It can't really be a bare performance issue because naturally I hooked up the hard drive to the laptop via USB-Sata and re-played all of my games and they all play much better and can be run at native res, vs barely passing 640x480 on the pentium system.
Oddly enough, this laptop shipped with a 32-bit OS and it's always bothered me that 800 or so MB is just.. wasted but whatever.
It seems like it's only using 1 core or thread but it's set affinity to all processors 0-3
Notice the crappy 4FPS and this is on FAR render distance, whereas on the pentium it's around 30
On the laptop playing on tiny it's around 40
I plan to create a machinima soon and neither of my systems are good enough to record at decent framerates.