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I have a Virtual Machine running on VirtualBox, on which I installed Ubuntu 11 Server (I left it "plain vanilla", it just runs Apache and MySQL). I created a shared folder with Samba and I can access it correctly. However, I noticed that copying files from/to the shared folder is quite slow compared to doing the same thing with my other VMs which run Windows (XP, 7 and Server 2008) and have the same virtual hardware.

At the beginning I also noticed a bit of slowdown when I logged in to Ubuntu with Putty. I read somewhere that disabling reverse DNS would help and, in fact, it sped up the login, but not the share.

Please note I'm running all these VMs on a single computer (one at a time) and I don't have a DNS Server, Domain Controller and so on.

I'm not an experienced Linux Administrator, therefore I might have done something wrong. If there's any detail that might help finding out what's wrong, I'd be happy to provide it. Thanks.

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Did you install VirtualBox guest add-ons to your Ubuntu? –  Janne Pikkarainen Apr 18 '12 at 13:15
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You can try to install virtual box tools on guest and check if that helps –  Alan Kuras Apr 18 '12 at 13:17
    
I think I installed them but I had to remove them for some reason. Unfortunately, I can't recall if this is the case or if I simply remember wrong. I'll give it a try and see what happens (I can take a snapshot before doing it, anyway). –  Diego Apr 18 '12 at 15:14
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