Extension causes high cpu load

- Issue Type: `Performance` - Extension Name: `vms-ide` - Extension Version: `1.5.41` - OS Version: `Windows_NT x64 10.0.17134` - VS Code version: `1.55.2`

Please find attached a CPU profile file:
[VMSSoftwareInc.vms-ide-unresponsive.cpuprofile.txt](https://github.com/vmssoftware/vms-ide/files/6413969/VMSSoftwareInc.vms-ide-unresponsive.cpuprofile.txt)
