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Description of problem:
I tried to transfer a large video (450MB) from the client (Win7) to the guest (RHEL6.5), and the guest was unusable for around a minute while the file was being transferred, trying to type in a terminal in the guest, pixels refreshing can be seen very clearly as it updates the whole terminal window, which takes seconds.

Version-Release number of selected component (if applicable):
Client Windows 7:
mingw-virt-viewer-0.5.6-6.el6_4

Host: 
RHEL6.5Snap1(RHEL6.5-20130925.2)
spice-server-0.12.4-3.el6.x86_64
qemu-kvm-0.12.1.2-2.406.el6.x86_64
libvirt-0.10.2-27.el6.x86_64

Guest:
RHEL6.5Snap1(RHEL6.5-20130925.2)
spice-vdagent-0.14.0-2.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Transfer a large file from client to guest
2.
3.

Actual results:
Transfer is successfully but guest is unusable for 1min.

Expected results:
Transfer is successful and guest is usable during the transfer process.

Additional info:

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Just tried this with a 3GB file, and the VM was responsive. Transfer took 10+ minutes but was successful (md5sum matches). This was over a LAN. Could it be that the file transfer saturated the link between client and host? Are you still seeing this issue?

close based on Comment #3

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days