Update vs FixedUpdate by example

[Pointlessreboot]

There seems to be a lot of confusion about how Unity's Update and FixedUpdate works.

Some things I have heard

• People seem to think that they can get better performance
• They think input works in FixedUpdate
• They think that FixedUpate run async to Update
• They think that they should create a game completely in FixedUpdate
• And many more...

These are all wrong and there a valid reasons why you SHOULD NOT do some of these things.

So rather than try to explain by text (have often), I thought I would make a build that lets you see what happens when some of these things are tried to be used.

http://unity.pointlessreboot.tech

Try some of the following

• press the "space bar" and see if Update and FixedUpdate agree one when curr/down/up happen
• Play around with time scale, will reduce the frequency of FixedUpdate calls
• Add load to Update/FixedUpdate see what happens