Performance column on the contests/with page

[meooow25]

Currently hard because of the number of API calls it would need (2 x number of contests).
Might be doable with some caching.

[kristevalex]

Wanted to make this feature request myself, but found it here. So totally endorse this one)

[kristevalex]

Isn't it possible to calculate the perfomance using rating after the contest and delta? Like: perfomance = previous_rating + 4*delta = final_rating + 3*delta?

[kristevalex]

Isn't it possible to calculate the perfomance using rating after the contest and delta? Like: perfomance = previous_rating + 4*delta = final_rating + 3*delta?

[meooow25]

Ah, but that is only an approximation. See this comment from ffao about how well it works. The true value depends on all participants in the contest.
If you are satisfied with the approximation then there is a userscript for that: https://greasyfork.org/en/scripts/402180-codeforces-performance