Do not call fundamental-mode if lv buffer is already in fundamental-mode #421
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Actually calling the fundamental-mode function can be a bit slow, because it involves running change-major-mode-hook and also doing a mode-line redisplay. When the lv buffer is re-created over and over, this can contribute to significant visual stuttering. For example, in Spacemacs, pressing SPC w . (window transient state) and then holding down } (enlarge) lags heavily before this change, but is much smoother after. Preserve the behavior of abo-abo#364, however, to ensure that the lv buffer is still in the correct major-mode.
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This change seems to be a definite improvement and would be great to see merged. It does make a difference on my system, though the example of resizing windows in Spacemacs still stutters quite a bit for me. This is probably due to a combination of a relatively old CPU, a high key repeat rate, and non-trivial members in the relevant hooks. I had investigated the same underlying performance problem with the scroll transient state in Spacemacs and came up with this workaround: #422 |
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Actually calling the fundamental-mode function can be a bit slow,
because it involves running change-major-mode-hook and also doing a
mode-line redisplay. When the lv buffer is re-created over and
over, this can contribute to significant visual stuttering.
For example, in Spacemacs, pressing SPC w . (window transient state)
and then holding down } (enlarge) lags heavily before this change, but
is much smoother after.
Preserve the behavior of #364, however, to ensure that the lv buffer
is still in the correct major-mode.