htop reviews the status of two running emacs servers as:
The number of executing threads is a constant of 3 and stay instant even though more buffers and windows opened from a frame.
Does it limit the thread up to 3?
Emacs is by and large single-threaded, so those 3 threads are most likely auxiliary threads used internally by Gtk, Glib, or some such library used by your Emacs build.
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