This pack needs at least 2GB of RAM to run without frequent lag spikes. By default only 1GB is assigned. You can fix this by going into the Technic Launcher, clicking Launcher Options in the top right corner, clicking on Java Settings, and then changing the Memory setting to 2GB or more. If you don't have any option higher than 1, you will need to install 64Bit Java, which can be found here: http://j20.474avadl.sun.com/webapps/download/AutoDL?BundleId=101408