In the standard source editor, when a preview is generated additional information is provided below the editing window: templates used in the preview, hidden categories that the page belongs to, and parser profiling data (PPD).

If possible, I would like to see parser profiling data implemented as extra information in 2017 wikitext editor previews so that editors like me don't need to toggle the beta editor on and off to check. Some of the information it provides is helpful, especially PEIS: some large articles (especially those dealing with COVID-19) cannot transclude templates further down the page when the PEIS limit is breached. Analysing the PPD on sections of the page helps determine which sections are using up the most PEIS.