I seem to recall someone mention an issue like this relating to intellisense. If you have a licensed version of LinqPad, you could try temporarily removing the license (which disables intellisense) to see if this is the cause.
I have reported slow performance with intellisense in the past. This behavior can also be caused by having many custom .dll references on slow network drives.
Comments
- What version of LINQPad are you using?
- What language have you selected?
- Have you selected a connection, if yes what type of connection?
Can you try troubleshooting with ProcMon (https://technet.microsoft.com/en-us/library/bb896645.aspx) and observe what "LINQPad.exe" is doing during the time of 4-minute delay?