I'm sure banks aren't wanting their employees to be doing non bank things on their computers
About the older browsers, that's going to also be a very small percentage but if your projected users will be for some reason, you may need to have a very simplified version of your app but you can use a JS framework for the vast majority that will have a more modern browser.
Hardware, for mobile there are things you can do to protect yourself from devices that are older. The good thing about mobile devices is people seem to upgrade much more frequently than they do an actual computer.
Things like if a component isn't viewable on screen, it shouldn't be rendered. You can do this by removing the component from a container but not destroying it. Then when it is to be made visible add it back to the container and it will be rendered again.
I am really interested in knowing whether you have decided to use sencha for building your ecommerce site or not? we are building an ecommerce platform where we will allow users to create their own shops online and we are wondering whether or not the shops should be extjs applications or not? will users have load time and performance issues on slow connections like when they are sitting in starbucks?
are there any ecommerce sites out there that use extjs?
Why does the ecommerce domain effect the performance of the app?
Surely its how the site is written that counts? And how many features it has (and therefore classes/components/styling).
You could build a single page ext js app for ecommerce and expect < 1Mb of minified js and css.
You have to put that into perspective. Is that reasonable for say a Play store app? I think it is.
But also since it's single page app - that's it: 1Mb once, the rest is relatively small ajax calls. Very performant indeed. Any bottlenecks are going to be in your back-end business / data tier - nothing to do with UI framework.
Hats off the the latest Sencha CMD tool that is very intelligent and effective at packaging up the app's assets into the smallest common denominator.
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