ZenTest Test::Rails Slowness

Before Test::Rails (for test:units)

Finished in 31.025 seconds. 267 tests, 752 assertions, 0 failures, 0 errors

After Test::Rails (for test:units)

Finished in 172.077 seconds. 267 tests, 752 assertions, 0 failures, 0 errors

Has anybody else experienced this? (Part of the reason it takes 30 seconds even before Test::Rails is because I'm using a remote Oracle database)

Thanks,

Dan