I have multiple report links displaying calendar based on a selection within a form, however, the form is very slow. Any alternatives?

I'm guessing that you have lots or calendar report links on the form, perhaps dozens, so the form needs to actually calculate the results for each even though maybe they are in separate tables or hidden by form rules.

An alternative is to have buttons on the form to flip between alternate forms (ie, Re-Display the record on a different form), and each form would have a different calendar or at least a small set of Calendars.

I feel like we talked about this a week ago, maybe that was somebody else...

I'd suggest changing the report link field to use the value of the "related case manager".

If you need it to filter by both the case manager and the record, then you can create a concatenated field that puts both values together.

24 Report links is no bueno.