According to Fabrice, the safe ceiling for local storage is 15mb. We should test to determine at what point the cached current data meets/exceeds that limit.

After db-transformer: 4096 apps gives me 11MB preloaded.json 5500 apps gives me 14.7MB preloaded.json If I'm not misled, dumping into localStorage will yield approx. the same size.

You need to take into account darjeeling own size and most importantly, icons and the first thumbnail for each app.

In theory: Darjeeling assets (appcache): 210KB App icon (appcache): ~15KB/app App preview (appcache): ~40-80KB/app (towards ceiling of range of preview sizes) App JSON (localStorage): ~3KB/app (58-98 * apps) + 210 = 15360 (in KB) Which is about 155 to 261 apps, with previews being the deciding factor. In practice: mathieu reported 1.5MB appcache used for 30 apps, which roughly works out to ~300 apps. Conclusion: we are talking about on the order of a few hundreds of apps.

previews and icons should be much lower with the new size for thumbnails and lossless compression (which is enabled now, but we haven't re-generated everything yet) For instance, for the youtube app: old thumbnail is 64K, icon is 5.2K new thumbnail is 19K, icon is 4.9K I'd expect the range to be 5-10K for icons, 15-25K for previews (obviously some of them can be much bigger depending on complexity)

Did we run it for m.f.c? I saw some 15-20K icons and 60-80K previews? I was basing it off of that.

It's enabled for new thumbnails and icons on dev, but just for new uploads. There is a script to re-generate all thubmnails and crush everything but I haven't ran it anywhere but locally yet, which is why you saw bigger icons/thumbnails.

Okay. Given 10K icons, 25K previews, we could have 400 apps.