Time dilation after epoch is saved during training

[chyren71]

I have an RTX 2060 super with 8gb ram and running a 2 epoch, 75 step AdamW on 20 images,

I have noticed an issue when saving epoch steps during training, after the first epoch is saved to disk the training slows down and varies and altough the shell displays 1it/sec it takes a real time value of 7-8 sec per iteration, the first epoch took 10mins and the 2nd one took almost 4 hours. When I run it for 15 epochs /10 steps, 20 images without saving epochs each epoch takes 10mins... So the issue seems to occur after the epoch is saved to disk. Is it a known issue?