Optimize page loading, step 2: Split into parts
Optimize page loading, step 2: Split into parts

Split $initPostsThread into $initPostsThreadStep1 and
$initPostsThreadStep2.  Split "top level" functions into initForms() and
initAndDrawSvg().  Call all these new functions one at a time, a while
after the jQuery ready event.  The user won't notice each individual
part. (But if you run them all at once the user will notice.)

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