Large quotes are slow to load, a system option for paginating a selected number of records on a quote would allow CRM performance to not be impacted by the number of columns or rows on a quote. currently we see performance issues over 200 rows but only really need to se 50 at a time so don't mind jumping to page 1,2,3 etc. So exactly the same implementation that is done for reports would be fine with a dropdown to choose how many records.
A combination of this and being able to collapse groups https://ideas.prospect365.com/ideas/SPA-I-2831 would improve the UI significantly