Re: Try time (decode) and size for null glyf/loca xform vs regular vs woff1

Fun stat on that subject, we are able to serve woff2 to well over 60% of
our clients today. My napkin math suggests in the not too distant future
that could approach 90%.



On Thu, May 19, 2016 at 11:13 AM, Levantovsky, Vladimir <
Vladimir.Levantovsky@monotype.com> wrote:

> Thank you Rod!
>
> The results are impressive, considering both memory and decompression time
> decreases compared to widely used WOFF 1.0 I hope that wide adoption of
> WOFF2 will be a fast and easy process.
>
>
>
> Cheers,
>
> Vlad
>
>
>
>
>
> *From:* Roderick Sheeter [mailto:rsheeter@google.com]
> *Sent:* Thursday, May 19, 2016 12:00 PM
> *To:* WebFonts WG
> *Subject:* Try time (decode) and size for null glyf/loca xform vs regular
> vs woff1
>
>
>
> As requested in https://www.w3.org/Fonts/WG/track/actions/186 I ran a
> variety of compress/decompress scenarios over the Google Fonts collection.
>
>
>
> Main findings are:
>
>
>
>  * WOFF2 decompression uses less memory than woff, more than brotli
> standalone.
>
>
>
>  * WOFF2 decompression was faster than WOFF at min, median, and average
> but has a higher standard deviation and max.
>
>
>
>  * Applying brotli (using the "bro" utility; https://github.com/
> google/brotli/blob/master/tools/bro.cc) directly to a font (to simulate
> use via Accept-Encoding: br) resulted in a file that was larger than a
> transformed woff2 but fastest to decompress.
>
>
>
>  * WOFF2 decompression is slightly faster when there are no transforms.
> The most significant improvement is lower standard deviation and worst-case
> time.
>
>
>
> The brotli codebase is probably the most carefully optimized of the
> implementations I compared. WOFF2 without transform could likely be sped
> up, though some work is hard to dodge without violating the spec. For
> example, "the decoder MUST recalculate the checkSum value for each decoded
> table."
>
>
>
> Summary and raw results can be seen in https://docs.google.com/
> spreadsheets/d/1_ZYTFaG6_NJy7n_t-RpPDXCAZIKDP_1SXiJQz0o8QMg/edit#gid=
> 367643030.
>
>
>
> Cheers, Rod S.
>