We have found that Source Control object locking can cause severe lag and even instability in SSMS for distant servers. The additional lag affects the SSMS Object Explorer contextual dialogs (right-click). Often the dialog will timeout and fail to render or multiple tries. Although we are able to disable object locking via the RedGateSQLSourceControlEngine_EngineOptions.xml file it would be much nicer to have control from the GUI. This could be in the form of a global on/off switch, or could even add functionality to blacklist certain servers. Alternatively, you could build in some kind of functionality to detect servers with high-latency and automatically turn off object locking.