Fairfax County school officials decreased their budget request to county supervisors by $80 million Tuesday, but spikes in class sizes and cuts to sports programs remain on the table as they grapple with funding for the county’s so-called crown jewel.

Superintendent Jack Dale told supervisors the school board is no longer seeking an $82 million bump in funding from the county, as the school board requested last month. Instead, the school system will use more than $100 million saved in contributions to the Virginia Retirement System — the state General Assembly eased payment requirements for counties in the budget it approved Sunday — to fill gaping holes for a school system routinely cited as the magnet for county residents.