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Unreliable and slow term recognition in Studio 2019

Ever since I upgraded to SDL Trados Studio 2019, the term recognition function (I also use MultiTerm 2019) has been unreliable at best:

Sometimes it takes Studio forever to search through the termbases attached to a project (quite often longer than it takes me to translate the entire segment!), sometimes terms that are definitely in an attached termbase are simply not detected - even when the termbase is stored locally on my PC.

Whereas the former is simply annoying, the latter is unforgivable, not least since the problem does not occur on every single segment, but appears to be random.

What advice can you give me?