[plt-scheme] schematics takes 5 minutes to planet install?

On a reasonably modern Linux machine, installing schematics takes five  
minutes of user time:

clements at vogon:~ $ time planet install schematics schemeunit.plt 3 4

...


real	8m53.741s
user	5m34.997s
sys	1m53.497s


Is this expected?

John

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