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WebPagetest Forums - Speed Index (lower is better)

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Full Version: Speed Index (lower is better)
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What exactly is Speed Index 469? See test here:

Is it possible to add some percentile or indicator [red, yellow, green]? Also, some reference to Google, Yahoo speed index may help to understand performance better.

Also, is it possible to add daily average, or something?

This will help you alot. Compress images.
PHP Code:
Compress Images43/100

142.2 KB total in images
target size 61.5 KB potential savings 80.6 KB

- (48.7 KBcompressed 11.5 KB savings of 37.2 KB) -
FAILED - (41.9 KBcompressed 11.3 KB savings of 30.5 KB) -
FAILED - (29.6 KBcompressed 19.7 KB savings of 10.0 KB) -
WARNING - (5.4 KBcompressed 3.9 KB savings of 1.5 KB) -
WARNING - (5.4 KBcompressed 4.0 KB savings of 1.4 KB) - 

Scroll down this page and it shows you the offenders and how many kb you can save on them. Clicking on "Analyze JPEG" takes you to the optimized image - the work is actually done for you by WPT - choose the one with the smallest file size, save to your computer, rename to match what is on the server and upload there to overwrite.

Also, get rid of any png images you have that aren't transparencies - make them into compressed progressive jpegs to save still more kb and thus, get still more speed.

All this will speed your site up some more, lower your speed index number too, it will also get rid of that F grade for image compression.
The Speed Index title is a link that takes you to a document that explains it:

It's effectively the average time when pixels were rendered. So a 469 means that on average the page content was displayed at 469ms (it doesn't mean that at 469ms specifically anything happened, it's just the average).

It's an absolute time and not referenced against anything else (just like load time or start render).
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