However, if you'd prefer a more frequent sync, you can change the behavior with a Terminal command like
defaults write com.omnigroup.OmniFocus MaximumTimeBetweenSync <number of seconds>
Hope that helps!
I do need to say something about OmniFocus and this is as good a place as any to say it.
I have used a variety of software packages on a Windows, Mac, iOS and PalmOS to implement GTD, some half-heartedly. I purchased OmniFocus in 2008 for the iPhone but back then there wasn't a sync solution that worked for me and I was put off by the price of the desktop client. After wandering 40 years in the GTD software wilderness, I remembered OF and decided to see if things had changed. I found the new sync server solution was just what I was looking for.
My productivity has gone through the roof since I moved from my "free" web-based solution to OmniFocus. Sometimes, the most expensive and time-wasting product you can "buy" is free. After a week with OF on my Mac, iPhone and now iPad, I deleted all the other GTD products without a second thought. OF is GTD purpose-built and I appreciate its fast data entry and the concept of a single action list. Life is good for Mac owners.
I do believe it takes study and effort to use OF effectively. I purchased some materials online and studied them after watching the tutorial and the "ninja" videos. It took me a few days to digest and I am still learning more every day. I have decided that buying decisions should never be made based on offhand user comments from the uninformed. I have always told my students to obtain and become an expert in the best tools you can find. Perhaps it is time for me to follow my own advice.
We can have it good, fast or cheap. Pick two.