catastrophic performance

[plbowers]

Issue Type: Bug

After a recent upgrade (both the vim emulator and the vscode editor, I believe) my performance has absolutely tanked.

I am waiting 10 and 20 seconds for the buffer to catch up to my keyboard buffer. Previous to this update I was typing naturally and never noticed any lag at all.

Steps to reproduce? Press i or cw or A or etc to go into editing mode and start typing.

Extension version: 1.3.0
VS Code version: Code 1.32.3 (a3db5be9b5c6ba46bb7555ec5d60178ecc2eaae4, 2019-03-14T23:43:35.476Z)
OS version: Windows_NT x64 10.0.17763

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-7300U CPU @ 2.60GHz (4 x 2712)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: enabled surface_synchronization: enabled_on video_decode: enabled webgl: enabled webgl2: enabled
Memory (System)	7.93GB (1.04GB free)
Process Argv
Screen Reader	no
VM	0%

[Hultner]

I just started using vscode (with vscvim) and I've noticed this as well. I was assuming that vscode/vscodevim was just this slow but maybe it's just this version? I've also noticed that the entire editor sometimes changes color theme back to the default dark one when I queue up to many actions in vim, especially when I use recordings.

[plbowers]

I ran the process explorer and saw that my CPU usage went way high as soon as I tried to do anything in edit mode. I disabled the vim extension and the problem disappeared entirely.

I am attaching a profile
CPU-20190406T060715.189Z.cpuprofile.txt

[jpoon]

#3662

[jpoon]

The performance degradation in the 1.3.0 has been resolved in the latest revision with #3662. As such, im goign to close this out.

[Hultner]

@jpoon Thanks, I'm so happy that this was a bug and not actual expected performance :D

Huge thanks to you and the rest of the team behind VSCodeVim for the hard work making this a reality.

[jpoon]

All credit goes to @ajalab on that one.