I was running into similar start up delays until I removed Sophos anti-virus from the system. Apparently when the system awoke the AV was running a quick memory scan before allowing things to run. Or at least that is what I was able to surmise. After that I tried two or three other AV packages before giving up and going barefoot. Since then — no start up delays.
"All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information" --Walt Disney
