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doc: benchark: laptop results for 1.8.0

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@ -70,32 +70,17 @@ Scrollback=10000 lines
### Results
| Benchmark | Foot (GCC+PGO) 1.7.0.r2 | Foot (no PGO) 1.7.0.r2 | Alacritty 0.7.2 | URxvt 9.22 | St 0.8.4 | XTerm 366 |
|------------------------|------------------------:|-----------------------:|-------------------:|-----------------:|--------------:|----------------:|
| alt-random | 0.714s ±0.047 | 0.900s ±0.041 | 1.586s ±0.045 | 1.684s ±0.034 | 2.054s ±0.121 | 37.205s ±0.252 |
| alt-random-colors | 0.736s ±0.054 | 0.950s ±0.082 | 1.565s ±0.043 | 2.150s ±0.137 | 2.195s ±0.154 | 33.112s ±0.167 |
| scrolling | 1.593s ±0.070 | 1.559s ±0.055 | 1.517s ±0.079 | 1.462s ±0.052 | 3.308s ±0.133 | 134.432s ±0.436 |
| scrolling-filled-lines | 1.178s ±0.044 | 1.309s ±0.045 | 2.281s ±0.086 | 2.044s ±0.060 | 2.732s ±0.056 | 20.753s ±0.067 |
| unicode-random | 0.349s ±0.009 | 0.352s ±0.007 | 0.148s ±0.010 [^1] | 19.090s ±0.363 | crashed | 15.579s ±0.093 |
| Benchmark (times in ms) | Foot (GCC+PGO) 1.8.0 | Foot 1.8.0 | Alacritty 0.8.0 | URxvt 9.26 | XTerm 368 |
|-------------------------------|---------------------:|-----------:|----------------:|-----------:|----------:|
| cursor motion | 14.49 | 16.60 | 26.89 | 23.45 | 1303.38 |
| dense cells | 41.00 | 52.45 | 92.02 | 1486.57 | 11957.00 |
| light cells | 7.97 | 8.54 | 21.43 | 20.45 | 111.96 |
| scrollling | 158.85 | 158.90 | 148.06 | 138.98 | 10083.00 |
| scrolling bottom region | 153.83 | 151.38 | 142.13 | 151.30 | 9988.50 |
| scrolling bottom small region | 143.51 | 141.46 | 162.03 | 192.37 | 9938.00 |
| scrolling fullscreen | 11.56 | 11.75 | 22.96 | 21.49 | 295.40 |
| scrolling top region | 148.96 | 148.18 | 155.05 | 482.05 | 10036.00 |
| scrolling top small region | 144.26 | 149.76 | 159.40 | 321.69 | 9942.50 |
| unicode | 21.02 | 22.09 | 25.79 | 14959.00 | 88697.00 |
[^1]: [Alacritty and "unicode-random"](#alacritty-and-unicode-random)
# Alacritty and "unicode-random"
Alacritty is actually **really** slow at rendering this (whether it is
fallback fonts in general, emojis, or something else, I don't know).
I believe the reason it finishes the benchmark so quickly is because
it reads from the PTY in a separate thread, into a larger receive
buffer which is then consumed by the main thread. This allows the
client program to write its output much faster since it is no longer
stalling on a blocked PTY.
This means Alacritty only needs to render a couple of frames since it
can reach the final VT state almost immediately.
On the other hand, `cat`:ing the `unicode-random` test file in an
endless loop, or just manually scrolling up after the benchmark is
done is **slow**, which besides being felt (input lag), can be seen by
setting `debug.render_timer = true` in `alacritty.yml`.
![Graph of benchmark results for a laptop](benchmark-results-laptop.svg)