What I can imagine is that for whatever reason, it takes more time for
"less" to scroll by a page than the keyboard repeat interval. Then if
you press and hold PageDown, more and more occurrences of it will
cumulate in the keyboard buffer, without "less" being able to catch up
and empty them.
VTE is very fast in handling less's output and rendering a pageful of
data, so I can't imagine this being the bottleneck. Probably the disk is
slow ("less" is waiting for reading the contents), or "less" is
problematic in some other way, or all of this happens over a slow
network connection. If so, there's nothing VTE or Terminator could or
should do about it.
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https://bugs.launchpad.net/bugs/1661233
Title:
PageDown buffer not useful
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