Hello,
I am having similar performance issue. I have a a table of 1500 rows which is a dump from a Github project, It takes 3 min to open the dc on a chrome browser. This is really not workable at all.
Any suggestion?
Thanks!
Farzin
CORRECTION: It’s been 10 min actually trying to load and make a group … and still not loaded …
Dear @Farzin , welcome to the community 
I’m sorry to understand about your negative experience.
You might want to reach out to support@coda.io to troubleshoot your doc.
We’ve announced additional improvements to performance, especially for docs with tables in them: Update: Our continued commitment to performance
But wait – there’s more! Calculations (and things in your docs that previously waited for calculations to finish) have received some much needed love and performance improvements as well: Improvements to Calculation Performance