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Demystify page load performance with WProf (2013)
| Venue: | In USENIX NSDI |
| Citations: | 30 - 5 self |
BibTeX
@INPROCEEDINGS{Wang13demystifypage,
author = {Xiao Sophia Wang and Aruna Balasubramanian and Arvind Krishnamurthy and David Wetherall},
title = {Demystify page load performance with WProf},
booktitle = {In USENIX NSDI},
year = {2013}
}
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Abstract
Web page load time is a key performance metric that many techniques aim to reduce. Unfortunately, the complexity of modern Web pages makes it difficult to identify performance bottlenecks. We present WProf, a lightweight in-browser profiler that produces a detailed dependency graph of the activities that make up a page load. WProf is based on a model we developed to capture the constraints between network load, page parsing, JavaScript/CSS evaluation, and rendering activity in popular browsers. We combine WProf reports with critical path analysis to study the page load time of 350 Web pages under a variety of settings including the use of end-host caching, SPDY instead of HTTP, and the mod pagespeed server extension. We find that computation is a significant factor that makes up as much as 35% of the critical path, and that synchronous JavaScript plays a significant role in page load time by blocking HTML parsing. Caching reduces page load time, but the reduction is not proportional to the number of cached objects, because most object loads are not on the critical path. SPDY reduces page load time only for networks with high RTTs and mod pagespeed helps little on an average page. 1
Keyphrases
demystify page load performance critical path page load time load time cached object server extension html parsing many technique significant factor lightweight in-browser profiler average page page parsing end-host caching wprof report javascript cs evaluation popular browser present wprof significant role page load high rtts detailed dependency graph critical path analysis key performance performance bottleneck synchronous javascript modern web page object load web page load time network load web page
