Why is getting patches so slow

We have a patch proxy setup to speed up installation of patches.
But it struck me that downloading a patch for the first time to cache it is surprisingly slow.
So I looked into it and observed that patch 113886-34 which was downloading at the time had taken 40 minutes to download about 25 Megs (of the 45 meg patch size). A speed which worked out at about 10k per second.
So as a comparison I manually downloaded the jar file from sunsolve and it came through at about 300k per second.
So why is downloading patches through smpatch update and a local patch proxy 30 times slower than downloading them manually.?

Well, which one should it be ?
By default, I have:
patchpro.patch.source https://getupdates1.sun.com/
Once in a while it complains due to a connection reset (it's a slow link on our end as well at this point but still)
Since I have several systems with the same hardware, I've tried to set up a patch server. That one points to:
Patch source URL: https://getupdates1.sun.com/solaris/
But I also pointed to (as the instructions mention) to getupdates.sun.com
At that time, I pointed the clients to:
patchpro.patch.source http://xxx.xxx.xxx:3816/solaris/
Yesterday afternoon all I would get where connection resets. Now it starts to download a couple of patches but eventually it dies.
But I also noticed that some have it set to:
patchpro.patch.source - https://updateserver.sun.com/solaris/
So, which one should it be, a) for a direct connection and b) for the patch server.
All boxes are solaris 10, and the ones I've tested do have the latest (rev. 8) update manager patch.
Note that we have a SunSpectrum silver contract, so I'm not sure if we should be pointing this to somewhere else instead...
Even with our slow link, I never have problems downloading patches via RHN for our other servers... I thought after 1.5 years this would be 'useful'
In any case, smpatch get output is:
patchpro.backout.directory - ""
patchpro.baseline.directory - /var/sadm/spool
patchpro.download.directory - /var/sadm/spool
patchpro.install.types - rebootafter:reconfigafter:standard
patchpro.patch.source http://xxx.xxx.xxx:3816/solaris/ https://getupdates1.sun.com/
patchpro.patchset - current
patchpro.proxy.host - ""
patchpro.proxy.passwd **** ****
patchpro.proxy.port - 8080
patchpro.proxy.user - ""

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