New version is on its way.
Where we have the following enhancement on Overview:
"Color your timeline content based on project, type, status or priority"
More information in the release notes.
Hi @Jakub Trllo, you have almost answered yourself the question:
>> It's probably because every time is used `custom_attributes` key on entity, api is querying values of custom attributes?
It is quite possible that is what causing your slowdown.
If you don't need / care about what the previous value was you can think of turning off the auto_popluate using the context manager for it.
You can find further information here.
Let us know how it goes!