slack.com Slack: Where work happens

Mobile Usability

100/100

Good

Mobile Speed

68/100

Medium

Last tested: 2017-08-27

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slack.com Mobile Speed: 68/100
slack.com Mobile Speed Test Quick Overview

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 2 blocking CSS resources. This causes a delay in rendering your page.
Optimize CSS Delivery of the following:
https://a.slack-edge.com/e49ab/style/rollup-brand.css
https://a.slack-edge.com/6dfd6/style/where_work_happens.css
Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://snap.licdn.com/li.lms-analytics/insight.min.js (expiration not specified)
https://s.adroll.com/j/roundtrip.js (5 minutes)
https://s.adroll.com/pixel/4UHU5P4P3FESHLUMNBLWAU/…N2U4VSJGOVKC2WJLQNH.js (5 minutes)
https://www.googletagmanager.com/gtm.js?id=GTM-KH2LPK (15 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/406609519531182?v=2.7.6 (20 minutes)
https://connect.facebook.net/signals/config/783626275071512?v=2.7.6 (20 minutes)
https://d1ivexoxmp59q7.cloudfront.net/slack/live.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.
Minify JavaScript for the following resources to reduce their size by 520B (15% reduction).
Minifying https://s.adroll.com/pixel/4UHU5P4P3FESHLUMNBLWAU/…N2U4VSJGOVKC2WJLQNH.js could save 520B (15% reduction) after compression.

slack.com Mobile Resources


Total Resources73
Number of Hosts39
Static Resources27
JavaScript Resources24
CSS Resources2

slack.com Mobile Resource Breakdown