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0e1f616
(Get the code!)
No. MN never holds the GDK lock for a long time, nor while performing a blocking operation (such as name resolution). If it did, the UI would block, which is something the MN multi-threaded design is meant to avoid.
And even if some bug caused a thread to wait for the GDK lock for longer than intended, it would not cause high CPU usage since the GDK lock is a sleep lock, not a spin lock.