[Libreoffice-bugs] [Bug 115325] Regression: Calc v6 opens .ODS file slower than v5

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=115325

--- Comment #12 from Dan Dascalescu <ddascalescu+freedesktop at gmail.com> ---
> IMHO, 1.6 seconds [is] an acceptable delay.

That's an unrealistic way to think about the *increase* in file opening time.
We're talking about 1.6 *EXTRA* seconds, probably on high-end hardware, and
with no other CPU or disk-intensive tasks running in the background.

In the real world, the user is waiting 2.8 seconds for the file to open with
Calc v5, and 4.5 seconds to open it with v6, in the best case scenario.

First off: Why? What's the gain to the user?

Second: by saying "X is an acceptable performance decrease", are we simply
allowing software to get bigger and slower over time? By the way, 1.6 seconds
slower than 2.8 seconds is a rather horrible drop in performance - almost 60%
slower!

Third: there is a psychological threshold around the 3-second mark. Studies
show that 53% of visits are likely to be abandoned if pages take longer than 3
seconds to load[1].

> It's not worth it to expend time and man power to fix this issue.

What causes this slowdown in v6? What features or refactoring were worth a 60%
slowdown on opening a file? As a user, I don't see a compelling tradeoff to
upgrade to v6 in exchange for the performance hit.

Also, what other areas of Calc are affected by this slowdown?


[1]: https://pinboard.in/u:dandv/b:aa61eb185929

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