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Question by WillTex · Dec 22, 2015 at 07:52 PM · c#compilerupdate function

Are blank Update functions removed at compile time?

Usually when code is compiled it goes through a cleanup stage where empty things are removed and things are ordered around a little differently so that things run faster. Good examples include blank functions and unreachable code. Unity goes through some mono compiling which is a blackbox for me.

Another example of this is question is "OnCollisionStay". If it's blank and you have a few hundred rigidbodies it will take up significant time.

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avatar image Firedan1176 · Dec 22, 2015 at 08:05 PM 1
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No they're not, as Leuthil mentioned, and in fact, according to the forum thread he provided, it would be wise to not include those empty functions! Good luck.

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Answer by Leuthil · Dec 22, 2015 at 08:01 PM

They are not removed. At least based on the information in this forum thread.

Additionally, here is a Unity blog post that details how this all works.

In particular note the following:

If a MonoBehaviour has a specific method it is added to a proper list, for example if a script has Update method defined it is added to a list of scripts which need to be updated every frame.

The post goes on to explain the performance impacts of using blank Update functions (and/or other similar Unity methods).

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