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I have a problem with slow login times in Yosemite. Logging in is speedy after booting, but after a while (a few days usually) it slows down and can take 20-30 seconds. The time to load a new Terminal window / tab also increases. If I reboot, the problem is fixed...for a while. I tried the answers in this question and nothing seemed to work. I ran the profiling suggested here and this part of the output looks suspicious:

+   ! 8118 ???  (in login)  load address 0x10583c000 + 0x2a8f  [0x10583ea8f]
+   !   8118 openpam_dispatch  (in libpam.2.dylib) + 277  [0x7fff86957a7d]
+   !     8117 ???  (in <unknown binary>)  [0x1058c4bf2]
+   !     : 8117 ???  (in <unknown binary>)  [0x1058c40e9]
+   !     :   8117 ODRecordAuthenticationAllowed  (in CFOpenDirectory) + 258  [0x7fff9161df85]
+   !     :     8117 transaction_simple  (in CFOpenDirectory) + 448  [0x7fff91615274]
+   !     :       8117 _dispatch_semaphore_wait_slow  (in libdispatch.dylib) + 213  [0x7fff955c07f6]
+   !     :         8117 semaphore_wait_trap  (in libsystem_kernel.dylib) + 10  [0x7fff882b751a]

But further Googling hasn't turned up anything helpful for solving the problem. Any ideas on how I can further diagnose or fix this issue?

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