Currently in my org there are around 50 test class which just uses Apex mocking framework and has no interaction with database. I have other test classes that is actual Apex test classes(around 1000+). I know tests written using Apex mocks runs quicker since there is no database interaction.
Would adding @isTest(Parallel=True) would make Apex mock test classes more faster? I know using it on test classes that interacts with database can make it faster but the concern is those classes share the same data and can result in failure(UNABLE TO LOCK ROW ERROR). Hence I am exploring this idea only for test that are based on Apex mocks framework.