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Umbrella task for improving xmltools performance.
We have identified some areas that need immediate attention. For example, opening the healthcare schema takes a long time to render in design view. Similarly, if some changes are made in source view for some larger schemas like OTA, views take a long time to refresh those changes or the IDE hangs.
Fixed all sub-issues. Marking this as fixed.
Overall we have done a lot of tuning to imrpove the performance of opening and editing larger schemas.
New Issue 95331, and reopening of 85037 need to reopen this issue.
A lot of work has gone in ever since.