Slow assertion of a table

Current behavior:

My Angular application displays some movies in a table which I assert using Cypress. My 20 row table takes 15 seconds to assert on my machine. You’ll see Cypress basically hang and then resolve everything all at once. Asserting 40 rows takes 50 seconds, so performance seems to deteriorate exponentially.

Desired behavior:

I’m sure Cypress should be able to do this more quickly. If it’s a programming error, I’d be interested to know what it is. I’m using aliases and a nested for loop.

Test code to reproduce

Use this repo to reproduce. npm run e2e -- --watch to start Cypress, then click movies.feature. The assertion code can be found here. Worth noting I had a similar algorithm using then, which was almost equally slow.

Versions

Windows 10
Chrome 80

"cypress": "^4.4.0",
"cypress-cucumber-preprocessor": "^2.3.0",

[bahmutov]

You can avoid using aliases and get much faster speed, see PR example https://github.com/cypress-io/cypress-example-recipes/pull/487

If the table has “settled” and the individual values are not going to change, no need to access every cell individually

[jennifer-shehane]

I’m going to close this issue since you have a better workaround - particularly since the gist of the performance optimizations for Cypress are described in #6967