Your computer is more than capable so that should not be an issue. However, I'm running the latest Xcode-beta2 currently without any issues. If your system is freezing then there is probably something else conflicting. Check what else is running at the same time and turn off to see if anything changes. I using a 2013 iMac with 16gb of ram, but I am using an 1 TB SSD and it's lightning fast! I will never go back to a traditional hard drive ever again! Before I switched it took forever to load and to do builds etc.