did you checked the box 'create meshes'?
I'm using the Lite-C Full version. So no WED.
Press F11 when the game is running.
Then make a screenshot when the framerate is low (with F6) and post it here.
Then we can see (and help) what's your main problem
Here's the statistic panel:

Here's the whole screen (resized)

Here's the whole screen (actual pixel)
[CLICK HERE]FYI, I have checked the "100MB Nexus" in SED because some particle effects when be triggered will crash the game.