My report is running very slow

I have a pretty complex spreadsheet that runs correctly in the dashboard and produces a chart in the report. In the report, I allow the user to change about 20 inputs that impact the chart. When the user changes an input, however, it takes at least five seconds for the chart to update. I built the same chart in excel, and excel take less than a second to update. Is there a way to speed up my report?

Thanks,

Dan