Pasting text and moving cursor has huge delays in git bash terminal

Type: Bug

For example pasting this command takes 64 seconds. The duration seems to scale quadratically with the length.
```sh
git commit -m "aeadkfea jf auhofiua efhawef ofauwbv ubvuqwzbvubv uzb vuqz quzb u iwubvqwuibfqowb qub qeov qeuub fqi owebfiqbfqouieb qeuwbf qe buqiwfqiwufquiwbefquiwbefu q wifqiwbefqbf qfiqwu qiwebfqiwebfquiwebfq wfqiwe fqweif bf aerhgerg erg erg eirgebgs
```
|Length|Time|
|------|---|
|32|2 s|
|64|4 s|
|128|17 s|
|256|64 s|

Moving the cursor with the arrow keys is also really slow if the current input is longish.
In the video I'm just holding down the left arrow key for a few seconds, but the cursor keeps moving much longer and very slowly.

https://github.com/user-attachments/assets/55b9a0c2-deb3-4e4f-ac66-d6c8a89b0038

The process using up all the CPU is bash.exe, but it is not a problem when it is used standalone.

VS Code version: Code - Insiders 1.139.0-insider (c74ba73b780a4a33173c006e52560d61432f53d6, 2026-09-16T04:43:54Z)
OS version: Windows_NT x64 10.0.19045
Modes:

System Info

|Item|Value|
|---|---|
|CPUs|Intel(R) Xeon(R) CPU E5-1620 v2 @ 3.70GHz (8 x 3691)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x10de, DEVICE=0x11fa [NVIDIA Quadro K4000], DRIVER_VENDOR=NVIDIA, DRIVER_VERSION=10.18.13.5362 *ACTIVE*
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.19041.5794
Machine model name:
Machine model version:
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: unavailable_off
webgl: enabled
webgpu: enabled
webnn: disabled_off|
|Load (avg)|undefined|
|Memory (System)|31.95GB (3.76GB free)|
|Process Argv|--crash-reporter-id 59c38a97-6b20-42ad-b729-8c40ade347e9|
|Screen Reader|no|
|VM|0%|
Extensions: none
A/B Experiments

```
vsliv368:30146709
pythonvspyt551:31249597
nativeloc1:31118317
dwcopilot:31158714
dwoutputs:31242946
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g012b348:31231168
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hmra_i5g22:31518061
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cp_cls_t_1082:31535311
logging_enabled_new:31490725
jb_cp_cls_t_632:31543129
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jbcp_cls_pctr_t:31531130
cp_intellij_t_nes:31548657
gf14b233:31526830
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treatment-23-1:31555779
unuse_dynamic_mcp:31555281
0c1h4866:31562347
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autotiers:31584973
mangle-name-treatment:31568054
allow-signed-out:31574470
codex-agent-enabled:31566739
intellij_nes_preview_t:31580086
64a8d082:31573709
issue8950-5d26a188:31574957
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ae8b2313:-9
2bfb8b39:31576696
soft:31581111
1cff76af:31580265
96d59efc:31580278
links-treatment:31581067
7g328426_fixed:31583679

```