Ability to retain performance speed no matter the volume of users added to a workspace

Several engagements have experienced slow performance speeds with Concourse as a result of a high volume of users added to the workspace. Given Jira access is managed through Concourse, with SAP engagements that frequently have a combined PwC/client team of 150-300 people that need to collaborate on Jira, this will cause frequent pain points for our practice. Tickets have been raised in the past without much traction thus far.