I created a database with 120,262 work orders:
masterref=# select count(*), wo_status from wo group by 2;
count | wo_status
249 | C
110012 | E
10001 | O
In the Explode Work Order window, there is a slight hesitation when keying a work order number, and none when tabbing out of the cluster. There's 1-3 second lag when typing in the work order cluster on the Implode Work Order window, but then it's looking at over 100,000 candidate records. This doesn't seem unreasonable.