When I use AutoDJ to automaticly add songs to "Now playing", it goes very slow

When I click the last entry of the "Now Playing", there happens anything for 1 to 3 seconds. Then there's MM Activity and the next 5 songs are added and the clicked song starts playing.
I haven't got any autoscripts running, but there are over 30.000 songs

When I click anywhere else on songs, or don't use the AutoDJ everything is lightning fast in MM.
Please help,
Grtz Supergrover
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