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Google s own Page Speed20 is another Firebug plugin, in some aspects quite similar to YSlow, but worthy enough of your attention; in fact, I usually apply both, to make sure I m not missing anything For Page Speed to analyze a page, you ll have to start FireBug, pick Page Speed, and click Analyze Performance The main result it will provide is a page score, from 0 to 100, which reflects the quality (in terms of the predefined rules) of your application See Figure 149
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Each rule includes an icon (red for serious problems, yellow for warnings, green for approved parts, and blue for information) and by clicking on the plus sign next to the icon, you can get a more detailed explanation of the problem and a suggestion as to the required fix21 See Figure 1410
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20 See http://codegooglecom/speed/page-speed/ for the Page Speed site 21 See http://codegooglecom/speed/page-speed/docs/rules_introhtml for the list of applied rules
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Figure 1410 Clicking a rule provides further explanation as to the
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The Page Speed menu bar provides a Performance tab (whose results we have already seen) and a Resources tab The latter shows you all the resources (images, files, and more) that were downloaded from the server, with further information as to URL, size, and so on (See Figure 1411) You should study this page, and check whether most of the fixed resources could be loaded from the cache, and if files are being compressed; not satisfying these conditions would negatively impact the performance of your application Finally, a Page Speed Activity extra tool is provided (see Figure 1412) that produces a detailed timeline showing all the requests to the server, color coded by type, and with bars proportional to their actual times Having many of these bars roughly at the same time would indicate the need for joining files together (possibly by using bundles) or for caching, whereas long bars could possibly point out server delay problems or too long processes As we said, Page Speed is quite similar to YSlow (and even to Speed Tracer, though that runs on a different browser) but being able to apply different sets of rules and taking different measurements is the equivalent of going to several different doctors to confirm a diagnosis, so I d insist on using all tools, even if at times there is some considerable overlap between them
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Figure 1411 The Resources tab provides information on every request
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Figure 1412 The Page Speed Activity lets you analyze a timeline for your
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Let s finish the analysis of browser-based tools with JavaScript s own debuggers Firefox s Firebug, which we have already seen, has a Net panel that can produce a detailed list of all events and resources invoked by your application (see Figure 1413) This isn t as good as Speed Tracer s analysis, for example, but it can do as a starting point In a similar vein, you could use Safari s debugger, or Opera s DragonFly debugger (see Figure 1414), which can also produce a detailed timeline of events Of course, because you cannot at the time use Opera for GWT Development mode, it s less likely that you would want to use this browser
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14 Optimizing for Application Speed
Figure 1413 Firefox s Firebug debugger includes a Net tab, which shows
all events and their durations
Figure 1414 Opera s DragonFly debugger can also help; the only
problem is that you cannot use Opera for GWT development
Debuggers aren t specifically geared toward optimization, but on the other hand, they are always available as you do your development, so why miss using them
Summary
We have seen three ways of enhancing the performance of your application: design patterns, some GWT 2 new features, and browser speed measurement tools By combining all these solutions, you can find bottlenecks, detect slowdowns, and generally squeeze much more performance out of your application There s no single silver bullet that can fix all possible problems, but applying what we have seen here, you are on your way to a far more responsive application