Why would duplicated workbook run faster than the workbook I duplicated it from?

Hi Everyone,

I built a dashboard using 6 sheets. There were a couple of sheets I added to the dashboard that slowed the refresh time. I wanted to see how much faster my dashboard would run if I removed them from the dashboard but I didn't want to make changes to my workbook only to find it didn't help. I created a duplicate workbook as a tester for my edits. I found removing those sheets from my dashboard improved the speed and usability of the dashboard. I turned around and made the exact same edits to my original workbook. However, I found there's still a computing time around 30s - 60s long to populate the dashboard visualizations as opposed to the almost instantaneous population of visuals on my test workbook. Both are working off the same extracted data source.

I used the Performance Recorder on both workbooks and found the original workbook had way more events run than the duplicated notebook (see screenshots). I tried to search online why the duplicate workbook would perform better but unsure if I'm wording my query correctly.

Unfortunately, I am unable to share my workbook as it contains company-sensitive information. I'm just curious to know if there's anything I could do to improve the original workbook's performance to match the duplicate or if there's something that's naturally running in the background of the workbook causing this slow down.

Any explanation or help is greatly appreciated!

Thanks!