1) Are you suggesting to move elements from Job page or add background color or both?
2) Would you expect web site performance improvements if the changes you are suggesting would be implemented? If you expect improvements -- what kind of improvements and would it possible to measure them?
3) With posting date -- there could be more than one posting date. Recruiters re-post there jobs. The end of date range is not current date, it's the date when was this job was re-posted last time.
4) When users click on Google Map -- they not necessarily leave PostJobFree. Usually they just scroll the map.