Slow system speed while working in Production > Work Orders

We are working on DAX 3.0 with SP 5. We are facing one strange problem since last few weeks. The system performance goes very low while working in “Production > Work Orders”. Till date we have aprox. 38000 work order lines in Work Orders table. I personaly checked with many PCs, the performance problem is only in Work Order Table. Is there any special setting needed ? Can we control no. of orders to be displayed in this table ?