Issue 1:
The markdown editor very nicely supports nested language syntax highlighting which is awesome. One small addition to make things easier is adding a autocomplete list of standard language names used in markdown. Cursor after three ticks ``` would list the languages.

Optionally showing a symbol next to languages with syntax highlighting support would be kind of cool, but not needed.

To see a list of the languages that could be included:

https://github.com/github/linguist/blob/master/lib/linguist/languages.yml

Issue 2:
VSCode Version: 1.2.0

OS Version: OS X 10.11.5

Steps to Reproduce:

Open VSCode

Open any folders

Browse some code (eg. c++, ts, php). Loading speed should be normal at this point.

Leave VSCode alone and do step 3 every 10min. At 30min the opening time of file should be noticeable slower. After 1hr, VSCode will take 3-4 sec to load a 1KB c++ file.

Additionally, I notice one of the VSCode process is using a lot of cpu time even I just let it stay in the background. I highlighted it below:

ps -ef|grep Studio

501 553 1 0 10:16AM ?? 0:26.77 /Applications/Visual Studio Code.app/Contents/MacOS/Electron

501 554 553 0 10:16AM ?? 0:08.45 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper --type=gpu-process --channel=553.0.727979350 --no-sandbox --supports-dual-gpus=false --gpu-driver-bug-workarounds=16,17,31,36,40,50,54,61,67,70 --gpu-vendor-id=0x8086 --gpu-device-id=0x0166 --gpu-driver-vendor --gpu-driver-version

501 669 553 0 10:16AM ?? 0:01.60 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap --type=SharedProcess

501 679 1 0 10:16AM ?? 0:00.01 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Framework.framework/Resources/crashpad_handler --database=/tmp/VSCode Crashes --url=https://ticinocrashreporter.azurewebsites.net/crash --handshake-fd=61

501 698 1 0 10:16AM ?? 0:09.87 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap /usr/bin/git /Volumes/HD2/JS/Documents/code/JSDS/Test/angularjs2/qs utf8 /Applications/Visual Studio Code.app/Contents/MacOS/Electron 2.7.4 (Apple Git-66)

501 1117 1 0 11:28AM ?? 0:06.76 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap /usr/bin/git /Volumes/HD2/JS/Documents/code/JSDS/Test/c utf8 /Applications/Visual Studio Code.app/Contents/MacOS/Electron 2.7.4 (Apple Git-66)

501 1196 553 0 12:06PM ?? 1:08.19 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper --type=renderer --no-sandbox --lang=en-US --node-integration=true --background-color=#131313 --num-raster-threads=4 --enable-zero-copy --enable-gpu-memory-buffer-compositor-resources --content-image-texture-target=3553,3553,3553,3553,3553,34037,3553,3553,3553,3553,34037,3553,34037,34037 --video-image-texture-target=34037 --channel=553.7.1240100061

501 1198 1196 0 12:06PM ?? 0:00.42 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap --type=extensionHost

501 1199 1196 0 12:06PM ?? 0:00.35 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap --type=watcherService

501 1203 1196 0 12:06PM ?? 0:03.30 /Applications/Visual Studio Code.app/Contents/Frameworks/Electron Helper.app/Contents/MacOS/Electron Helper /Applications/Visual Studio Code.app/Contents/Resources/app/out/bootstrap /usr/bin/git /Volumes/HD2/JS/Documents/code/JSDS/Test/c utf8 /Applications/Visual Studio Code.app/Contents/MacOS/Electron 2.7.4 (Apple Git-66)

501 1219 783 0 12:08PM ttys000 0:00.00 grep --color=auto Studio