Close
Both.

When SPDY is enabled in Firefox downloads start at ~100KB/s and max out at ~600KB/s after a few seconds. Browsing pages when this occurs causes thumbnails to load one by one delayed.

When SPDY is disabled in Firefox start out at ~300KB/s and max out at ~1024KByte/s after a few seconds. Thumbnails load one by one delayed.

Normally, downloads start at ~2000KB/s and almost instantly jumps to 4000~6000KB/s near the limit of my 50Mbit connection. Thumbnails load instantly.