{"id":6752,"date":"2012-10-30T01:43:35","date_gmt":"2012-10-30T00:43:35","guid":{"rendered":"http:\/\/www.itwriting.com\/blog\/?p=6752"},"modified":"2012-10-30T01:43:35","modified_gmt":"2012-10-30T00:43:35","slug":"slow-javascript-performance-in-microsoft-surface-rt","status":"publish","type":"post","link":"https:\/\/www.itwriting.com\/blog\/6752-slow-javascript-performance-in-microsoft-surface-rt.html","title":{"rendered":"Slow JavaScript performance in Microsoft Surface RT"},"content":{"rendered":"<p>Outlook Web Access is useful on Microsoft\u2019s Surface RT, since the built-in mail client is only basic. However I noticed sluggish performance, which made me wonder if Microsoft\u2019s \u201cChakra\u201d JavaScript engine is slow on Windows RT.<\/p>\n<p>I ran the <a href=\"http:\/\/www.webkit.org\/perf\/sunspider\/sunspider.html\" target=\"_blank\">Sunspider<\/a> JavaScript performance test on the Samsung Slate 7 I bought back in February, which has a 1.6Ghz Core i5, and compared it to the same test on Surface RT, which has a 1.3 Ghz NVidia Tegra 3 chipset.<\/p>\n<p>The Samsung slate was 5.11 times as fast. Question: how much of that is down to the Core i5 being a faster CPU, and how much is down to a less well optimized Chakra engine?<\/p>\n<p><a href=\"http:\/\/www.itwriting.com\/blog\/wp-content\/uploads\/2012\/10\/image28.png\"><img loading=\"lazy\" decoding=\"async\" title=\"image\" style=\"border-left-width: 0px; border-right-width: 0px; background-image: none; border-bottom-width: 0px; padding-top: 0px; padding-left: 0px; display: inline; padding-right: 0px; border-top-width: 0px\" border=\"0\" alt=\"image\" src=\"http:\/\/www.itwriting.com\/blog\/wp-content\/uploads\/2012\/10\/image_thumb28.png\" width=\"404\" height=\"322\" \/><\/a><\/p>\n<p>Incidentally, the Apple iPad 2 which has an Apple A5 processors running at around 890 Mhz is approximately 33% slower on the SunSpider test. Since the CPU is clocked 45% slower that is a good result for the iPad 2 and Safari.<\/p>\n<p>A Google Nexus 7 on the other hand which has the same Tegra 3 chipset as the Surface is about 55% slower than the Surface, which is poor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Outlook Web Access is useful on Microsoft\u2019s Surface RT, since the built-in mail client is only basic. However I noticed sluggish performance, which made me wonder if Microsoft\u2019s \u201cChakra\u201d JavaScript engine is slow on Windows RT. I ran the Sunspider JavaScript performance test on the Samsung Slate 7 I bought back in February, which has &hellip; <a href=\"https:\/\/www.itwriting.com\/blog\/6752-slow-javascript-performance-in-microsoft-surface-rt.html\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Slow JavaScript performance in Microsoft Surface RT<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55,95,97],"tags":[],"class_list":["post-6752","post","type-post","status-publish","format-standard","hentry","category-microsoft","category-web-2","category-windows"],"_links":{"self":[{"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/posts\/6752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/comments?post=6752"}],"version-history":[{"count":0,"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/posts\/6752\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/media?parent=6752"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/categories?post=6752"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.itwriting.com\/blog\/wp-json\/wp\/v2\/tags?post=6752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}