This is because of the higher device pixel ratio of your mobile device. The higher the device pixel ratio, the bigger the requested WMS images, the more pixels to compose. If the device has a device pixel ratio of 2, the requested images will have 4 times the number of pixels, and composing them will also take 4 times as long. For 3 layers, this means 12 times the composition time compared to a device with a pixel ratio of 1.
My advice: remove the `serverType` configuration option from your WMS layers, which will make OpenLayers request tiles from the WMS with a pixel ratio of 1. Andreas. On Tue, Oct 11, 2016 at 8:13 PM, OL3 Dev on behalf of Julien-Samuel Lacroix <ol3-dev@googlegroups.com> wrote: > Hi, > > I have a really simple OL3 map, an OSM basemap with 3 WMS layers, based on > the WMS Tiled example page. Everything works fine in a browser, but when I > try this page on my mobile phone or on a tablet, the performance drops > drastically. > > The animation of a simple pan is slow and seems irresponsive. I ran the > Chrome Timeline tool on it and all the time seems to be spent in drawImage. > > drawImage > On a mobile (Nexus 6P) : 1288 ms (88% of the total time) > On a laptop: 5.6 ms (3% of the total time) > > Test application: > http://jsfiddle.net/r186zucL/ > > Do anyone as an idea of why we would see such a big difference in the > performance of the canvas renderer on mobile? > > Note that using only one layer at a time (instead of 4) makes everything > work alright. Also, when I test, I make sure to not pan to request new > tiles, so network should not be the issue. > > Best regards, > Julien > > -- > Julien-Samuel Lacroix > T: +1 418-696-5056 #202 > Mapgears > http://www.mapgears.com/ > > -- > You received this message because you are subscribed to the Google Groups > "OL3 Dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to ol3-dev+unsubscr...@googlegroups.com. > To post to this group, send email to ol3-dev@googlegroups.com. > Visit this group at https://groups.google.com/group/ol3-dev. > To view this discussion on the web visit > https://groups.google.com/d/msgid/ol3-dev/e013c3e6-eb75-390b-9be8-d65f7c737ff5%40mapgears.com. > For more options, visit https://groups.google.com/d/optout. -- Andreas Hocevar Geospatial Solutions Engineer | Boundless ahoce...@boundlessgeo.com @boundlessgeo -- You received this message because you are subscribed to the Google Groups "OL3 Dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to ol3-dev+unsubscr...@googlegroups.com. To post to this group, send email to ol3-dev@googlegroups.com. Visit this group at https://groups.google.com/group/ol3-dev. To view this discussion on the web visit https://groups.google.com/d/msgid/ol3-dev/CAOiJ94gK3q-1UuTZ3OR8CPhPyOnkU5hqMghJWYi0%2B_NVdG9Omw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
