ForumsQuestionsAnimations lag with calendar and others

Hi All;

For some time now I've been getting a lag with a few seconds of freezing when I click on "due date" and there's the brief animation of the calendar opening, and also after clicking the desired due date in said calendar.

This occurs in all browsers and all computers that I use. I have a high number of tasks, maybe 1500-2000.

Does anyone know why this might be happening, and if there is a way to fix it?

I have created a brand new account for testing, and the problem does not appear in that account.

Thanks in advance for any help / ideas!

Dan