I guess you meant 0.12.7 and 0.12.8. Indeed 0.12.7 performs superior to 0.12.8 in your fiddle.

Yes, you're right. Thanks for the correction. I've updated the issue now with the correct versions.

Actually the situation seems more complicated. The fix in 3333598 did indeed improve the performance but there is still a major performance regression when using a sufficiently complex large array (4,000 items) and filtering and slicing the items.It's fine in 0.11.x but nearly unusable in 0.12.x.

Unfortunately I don't have time at the moment to dig into this deeper and set up a new fiddle that demonstrates it. The filtering works fine when setting the value in JS but is terribly slow when inputting values in an v-model input form.

We have reverted back to 0.11.8 for now.

I also had a situaton when filterBy from user input was extremely slow in 0.12.7
I ended up implementing a custom filter for my case.

@duebbert are you filtering it in a computed property, or using the filterBy array? Did you specify a specific key to filter by like filterBy search in 'key'?

Regression when filtering large arrays should be fixed with 2a41b3a - @duebbert would appreciate if you can try it out

Will do but can only do that earliest on Monday.
On 23 Sep 2015 20:14, "Evan You" notifications@github.com wrote:

Regression when filtering large arrays should be fixed with 2a41b3a
yyx990803/vue@2a41b3a

• @duebbert https://github.com/duebbert would appreciate if you can try
  it out

—
Reply to this email directly or view it on GitHub
https://github.com/yyx990803/vue/issues/1248#issuecomment-142701233.

Just tested it and it seems to have fixed it. Excellent work. Many thanks!