New "Provided" JVM very unstable

MC is much laggier using your version of MC. Running the old MC, with a 64-bit 1.7 JVM makes MC a lot faster.

With the new JVM, MC seems to need to allocate a lot of memory, doing a full cleanup cycle every 3 seconds or so, making a huge lag spike (the Memory jumps up and down quickly). Every now and then MC crashes (once in an hour or so, see the JVM crash report attached.

Oh, and I have UAC completely disabled, doesn't fix it.