The digging speed directly depends on the number of saves in the ''..\Games'' folder of Heroes 3.
This is not very noticeable with a small number of saves, but when there are 200-300...
To solve this problem, you can temporarily move all unnecessary saves to another folder.
Example.
Map 72 x 72, processor AMD Sempron 2800+, RAM 512.
If there is 001 save in the ''..\Games'' folder, then 55 digs occur in 2 minutes.
If there are 300 saves in the ''..\Games'' folder, then 45 digs occur in 2 minutes.
The digging speed slowed down by more than 22%.
Quite a lot, especially if the desired hero is difficult to dig up.
Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up,
Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil;
Rejoiceth not in iniquity, but rejoiceth in the truth;
Beareth all things, believeth all things, hopeth all things, endureth all things. Charity never faileth...