The time the editor requires to enter playmode significantly increased in Unity 2019.3 compared to Unity 4.6. Reproduce Create new project Create new scene Press Play Write down how long it took to enter playmode Repeat these steps with Unity 4.6 and Unity 2019.3 Actual Entering playmode in an empty project takes significantly longer in Unity 2019.3 than in previous Unity releases. In my test: Unity 4.6 = 2 seconds Unity 2019.3 = 5 seconds Expected Newer Unity versions should not be slower than older ones. Note Please use hardware similar to the PC I used to submit the bug-report with. It probably can't be reproduced on high-end machines.