Adrian, Thank you for your tips. As you can see I've moved the thread. I'm new to GeoNet and didn't know which place I should choose. I am using Maplex set to Fast, so in this field I can't see any more options to boost performance (also my project has quite strict labeling guidelines, so it means even less options). I have, indeed, quite a lot of labels, also with formatting tags, nevertheless there should be a difference between labels from label expressions and just from attribute table. Expressions mean a lot more operations to do! Yet, the difference is not only minimal, but also opposite to expected. There is definitely something wrong.
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