Extension causes high cpu load

- Issue Type: `Performance`
- Extension Name: `vscode-node-red`
- Extension Version: `0.2.0`
- OS Version: `Darwin x64 18.2.0`
- VSCode version: `1.30.2`

:warning: Make sure to **attach** this file from your *home*-directory: `/Users/Onket_iMAC/formulahendry.vscode-node-red-unresponsive.cpuprofile.txt` :warning:

Find more details here: https://github.com/Microsoft/vscode/wiki/Explain:-extension-causes-high-cpu-load

Start with the reported vscode-node-red 0.2.0 extension and the VS Code guidance linked in the issue. Obtain or reproduce the missing CPU profile at the listed path and use it to identify the source of the high CPU load; done means the extension no longer exhibits the reported load under the stated environment.

Written by the indexing model from the issue text.