Low FPS on Tekkit and Technic

[C.Prezzure]

Well I like Tekkit and I like Technic however I have had to resort to using Tekkit on SSP rather than Technic because Technic slows to about 10 FPS... However I use Tekkit because I get about 5 frames faster... 15 FPS. It's really annoying me because I have 1.5gb ram allocated (tried 0.5 and 1.0gb) and I good enough computer that could run it... however on all the other threads I've looked at, everyone seems to have a NVIDIA graphics card and are able to run TechnicLauncher.exe by going right click and running with graphics card.... something I don't have either... Anyone Help?

Also I don't even need to have done anything for it to start to lag. It starts as soon as a start a map it lags.

Graphics Card: AMD Radeon HD 6520G

Processor: 4 Cores.... AMD A6-3410MX APU with Radeon HD Graphics 1.60 GHz

Ask me if you need anything else....