Slow when jumping to end of long file

[someonewithpc]

What steps will reproduce the bug?

1. Open a long file
2. Press Alt+>

What happens?

Long delay, and eventually it goes to the end of the file

What did you expect to happen instead?

A much shorter delay, like in less

How did you install bat?

Arch Linux AUR

bat version and environment

bat --diagnostic

Software version

bat 0.21.0 (405e5f7)

Operating system

Linux 5.18.1-arch1-1

Command-line

bat --diagnostic 

Environment variables

SHELL=/bin/bash
PAGER=<not set>
LESS=-asrRix8
LANG=en_US.UTF-8
LC_ALL=<not set>
BAT_PAGER=<not set>
BAT_CACHE_PATH=<not set>
BAT_CONFIG_PATH=<not set>
BAT_OPTS=<not set>
BAT_STYLE=<not set>
BAT_TABS=<not set>
BAT_THEME=<not set>
XDG_CONFIG_HOME=<not set>
XDG_CACHE_HOME=<not set>
COLORTERM=truecolor
NO_COLOR=<not set>
MANPAGER=<not set>

Config file

Could not read contents of '/home/hugo/.config/bat/config': No such file or directory (os error 2).

Custom assets metadata

Could not read contents of '/home/hugo/.cache/bat/metadata.yaml': No such file or directory (os error 2).

Custom assets

'/home/hugo/.cache/bat' not found

Compile time information

• Profile: release
• Target triple: x86_64-unknown-linux-gnu
• Family: unix
• OS: linux
• Architecture: x86_64
• Pointer width: 64
• Endian: little
• CPU features: fxsr,sse,sse2
• Host: x86_64-unknown-linux-gnu

Less version

> less --version 
less 590 (PCRE2 regular expressions)
Copyright (C) 1984-2021  Mark Nudelman

less comes with NO WARRANTY, to the extent permitted by law.
For information about the terms of redistribution,
see the file named README in the less distribution.
Home page: https://greenwoodsoftware.com/less

[sharkdp]

Can you provide some more infos? Like what kind of file you were opening?

It is somewhat expected that bat performs worse than less, because it does additional work (syntax highlighting). And some of the syntaxes are rather slow.

[someonewithpc]

Fair enough, but maybe it'd be possible to do the syntax highlighting after jumping, or something?

[sharkdp]

Not as long as we rely on external pagers (like less), but potentially if #1053 ever becomes reality.