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well,

 means that you have listed all channels. my patch is for channel list in groups (as stated in title), so you should measure time when selecting "All channels" group (or any other group with significant amount of channels).

There is no log message for channel list building in groups, so there is little chance that you can see the difference with 260 channels.

I can post here my channel table if someone wants to test it and feel the difference.