Cleaner planner slow loading

ive Had cleaner planner over a year now and it's always been really slow, it takes so long to send my window cleaning reminders out, at first I thought it was my internet speed but all other sites load up quickly, anyone else had this problem? And is there a different site similar to cleaner planner that's any good?

thanks.

Never had any issues. Is it email reminders? Or texts?

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