Even the most basic custom unit shaders are very expensive

[Beherith]

Where should I specify the simframe location in my shader definitions?

[hokomoko]

You want to add it in the framework here:
http://imolarpg.dyndns.org/trac/balates ... s.lua#L181

and here:
http://imolarpg.dyndns.org/trac/balates ... s.lua#L200

and it will be automatically loaded if your shader contains the uniform with that name.

[hokomoko]

attached a sample of how to use simFrame on wobbling trees,
sorry for the whitespace changes