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The new rendering engine separates the preview process from the main IDE process. That means if your preview crashes (which still happens occasionally), You just get a "Retry" button. Thank goodness.
Google finally optimized the Resource Manager and the Layout Inspector. In previous versions (looking at you, Hedgehog), clicking on a large XML layout file meant a 5-second lag spike. In Koala, it’s instant. android studio koala download
But let’s be honest: downloading a new IDE version usually feels like a chore. You cross your fingers, hope the bugs aren't too bad, and pray your Gradle build doesn't explode. The new rendering engine separates the preview process