1715712 - 0.75% installer size (OSX) regression on Thu June 10 2021

Status: RESOLVED WONTFIX

(Firefox :: PDF Viewer, defect)

Description

[Alexandru Ionescu (needinfo me) [:alexandrui]]

Perfherder has detected a build_metrics performance regression from push d9274ee98a37c90df78244030652b4965f9edd50. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Suite	Test	Platform	Options	Absolute values (old vs new)
1%	installer size		osx-cross		83,348,126.44 -> 83,970,120.83

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) will be backed out in accordance with our regression policy.

For more information on performance sheriffing please see our FAQ.

Comment 1

[Marco Castelluccio [:marco]]

The regression is expected because we started including some fonts in PDF.js (https://github.com/mozilla/pdf.js/pull/12726 and https://github.com/mozilla/pdf.js/pull/13517). This is needed to have correct rendering for PDFs that use some "standard" fonts without embeddeding them, and required for proper XFA support.