Would be happy to work through the performance issues with you, and we can try to look at problems that aren’t specifically caused by CodeMix as well. If there are serious performance issues with building / Maven, it would be good to get these fixed in core Eclipse.
Over the years we’ve found and fixed really odd issues (that don’t occur for everyone) due to edge cases in the core platform or fundamental 3rd party plugins; hopefully we can do the same for your issues too!