I have a problem with window.performance.now() in Safari 9. My OS is OS X Mavericks in Macbook Pro Mid 2010.

Apple released Safari 9 for OS X Yosemite and Mavericks users: /

caniuse/#search=performance says that in Safari 8 and 9 have support for window.performance.now():

but I just today updated from Safari 7 to Safari 9 and big disappointment: window.performance is undefined!

Should it work? Does it work for someone? Is this problem with my OS and/or hardware?

I have a problem with window.performance.now() in Safari 9. My OS is OS X Mavericks in Macbook Pro Mid 2010.

Apple released Safari 9 for OS X Yosemite and Mavericks users: http://www.macrumors./2015/09/30/apple-releases-safari-9-for-yosemite-users/

caniuse./#search=performance says that in Safari 8 and 9 have support for window.performance.now():

but I just today updated from Safari 7 to Safari 9 and big disappointment: window.performance is undefined!

Should it work? Does it work for someone? Is this problem with my OS and/or hardware?

• javascript
• safari
• osx-mavericks

• Works fine for me, Safari 9, Yosemite. – kombucha Commented Oct 4, 2015 at 19:34
• Does it give fractions? Test eg. here: jsbin./luxonuv/1/edit?js,output – Timo Kähkönen Commented Oct 4, 2015 at 19:40
• It seems that I have to update to El Capitan? – Timo Kähkönen Commented Oct 4, 2015 at 19:48

1 Answer 1

It was due to Mavericks. Safari 9 installed well on Mavericks, but for some reason performance.now() didn't work.

May be Apple will fix this bug in the next Safari update.

I installed El Capitan and it worked:

Here is my updated test page that uses performance.now() to measure function execution time: http://jsbin./qocojaducu/1/edit?js,output.