Status: New
Owner: ----
New issue 3950 by coola...@gmail.com: compile javascript asynchronously
https://code.google.com/p/v8/issues/detail?id=3950
Architecture: ARM
THE PROBLEM
------------------
I have so much JavaScript in my application that it is too much to load in
a single minified file without adversely affecting user experience, so I
take a hybrid pre-fetch / lazy-load approach (multiple large-ish bundled
modules).
The problem is that the lazy-loaded modules are large and or complex enough
that they cause the main thread to block for whole seconds (700 MHz single
core ARM processor).
Because of the dependency chain, it isn't feasible to lazy load everything.
My use case is actually node (see
https://github.com/iojs/io.js/issues/1083), but the problem applies to UI
blocking and network blocking the same.
In the case of the browser this would prevent scrolling, clicks, etc. In
the case of node it prevents what would be small, fast, network replies.
Bad. News. Bears. y'know?
DESIRED SOLUTION
------------
I'd like to be able to fetch the text of the script and then have it
compiled in the background so that the main thread isn't blocked.
The node guys tell me that they don't know of a hook in v8 to
asynchronously compile the text without blocking the main thread. See
https://github.com/iojs/io.js/issues/1083
However, I see on the chromium blog that last month you started
implementing features to address problems similar to this, so it sounds
like it's the type of issue you'd like to know about and provide a solution
for. See
http://blog.chromium.org/2014/02/compiling-in-background-for-smoother.html
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