Use portable software. From my experience it actually lives longer than web submissions, because I've lost several passwords in my life.
I won't argue this way because you install browser once for all webapps. Just like you install OS.
But instead I'll tell you why are web apps so slow:
There are 2 factors. One is that they are written in a scripting language, which has to be interpreted at runtime and therefore will always be way slower than machine code. I seriously doubt that they'll ever manage to make JavaScript engine "just" 10 times slower than C++ in usual tasks. However, at some point in the future it may not be a problem, possibly CPUs will catch up and make this difference small enough not to be noticeable. But this makes claims like "we'll offload your machines' work to our servers, so home computers will become small, cool, quiet boxes" laughable.
The second problem is internet connection. I've been using several lines ~1-2MBit and there have always been lag caused by network traffic. Again, maybe one day....but still: what for?
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