Haystack slow on first hits

[vemv]

I don't know exactly why, but the first time Haystack is used to analyze exceptions, it takes quite a few seconds. About 10 or so.

Later it becomes instantaneous.

It's long enough for one to believe it's not working.

Let's see if there's some low-hanging fruit. If not, probably performing related requires eaglerly would be a good compromise.

[vemv]

cider.nrepl.middleware.stacktrace> (try
                                     (/ 3 0)
                                     (catch Exception e
                                       (time (analyzer/analyze e))))
"Elapsed time: 12399.759643 msecs"

This happens even after requiringcider.nrepl.middleware.stacktrace / Haystack in advance.

Afterwards it's 30ms