Memory leaked. Bug or not.

[Pilad]

If you set the render distance to 32, the maincraft sits completely in memory. The internal server is heavily loaded. In the 32pre2, this process is very fast. It takes 5-10 seconds. on the 32pre1 version this process is less fast.

[draknyte1]

Vanilla doesn't even allow > 16.
So, try without Optifine.

Then, maybe provide us with version numbers for Forge, Optifine, IC2, etc.

[Pilad]

Last builds: Forge 1614 , OptiFine_1.7.10_HD_U_E3 , industrialcraft-2-2.2.828-experimental. GT 32pre1/pre2 use. Do you need something else?

[draknyte1]

Both Pre1 and Pre2 are horribly broken, so keep that in mind.
Pre2 mostly due to #1389.

Let me know how you go without Optifine.

[Pilad]

Without Optifine in the same way. At the render distance 32, eats memory.

[Blood-Asp]

Now what exactly changes about rendering beween pre1 and pre2?