This issue has now been resolved.
We've confirmed there is a problem, we are now monitoring the issue and it is beginning to recover.
We are currently aware of and actively investigating an issue that is affecting performance for some customer's access to OpenCRM or related services. Affected customers may see slow page loads, or pages intermittently not loading or responding.
Further updates including any expected timescales for this incident will be posted here as soon as they are available, and periodically as we continue to work on this issue.