Last active
August 29, 2015 14:01
-
-
Save p01/94e1df3c70d85572f8fd to your computer and use it in GitHub Desktop.
PDF.js profile slow pages
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| /* | |
| * Copy this gist into a snippet of the Sources panel of the DevTool and run it to profile slow pages | |
| * Alternatively the PDFView.PROFILE_THRESHOLD can be set in `ms` | |
| */ | |
| // threshold in ms to keep/discard CPU profile | |
| PDFView.PROFILE_THRESHOLD = 500; | |
| PDFView.renderHighestPriority = function pdfViewRenderHighestPriority_patched(currentlyVisiblePages) { | |
| if (PDFView.idleTimeout) { | |
| clearTimeout(PDFView.idleTimeout); | |
| PDFView.idleTimeout = null; | |
| } | |
| // Pages have a higher priority than thumbnails, so check them first. | |
| var visiblePages = currentlyVisiblePages || this.getVisiblePages(); | |
| var pageView = this.getHighestPriority(visiblePages, this.pages, | |
| this.pageViewScroll.down); | |
| // start of page rendering log | |
| var now = Date.now(); | |
| if (this.wasPageView) { | |
| var time = now - this._when; | |
| if (time < PDFView.PROFILE_THRESHOLD) { | |
| // discard the previous profile and start a short lived one called 'v_v' | |
| console.profile('v_v'); | |
| } | |
| console.profileEnd(); | |
| console.info(time + 'ms for the page #' + this.wasPageView.id + | |
| ' ' + this.url); | |
| this.wasPageView = null; | |
| } | |
| if (pageView) { | |
| this._when = now; | |
| this.wasPageView = pageView; | |
| now = new Date(); | |
| console.profile(this.url + | |
| ' #' + pageView.id + | |
| ' ' + "SunMonTueWedThuFriSat".substr(now.getDay()*3, 3) + | |
| ' ' + now.toLocaleTimeString()); | |
| } | |
| // end of page rendering log | |
| if (pageView) { | |
| this.renderView(pageView, 'page'); | |
| return; | |
| } | |
| // No pages needed rendering so check thumbnails. | |
| if (this.sidebarOpen) { | |
| var visibleThumbs = this.getVisibleThumbs(); | |
| var thumbView = this.getHighestPriority(visibleThumbs, | |
| this.thumbnails, | |
| this.thumbnailViewScroll.down); | |
| if (thumbView) { | |
| this.renderView(thumbView, 'thumbnail'); | |
| return; | |
| } | |
| } | |
| PDFView.idleTimeout = setTimeout(function () { | |
| PDFView.cleanup(); | |
| }, CLEANUP_TIMEOUT); | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment