Detectnet training appears slower

Hi, I hope this is the right place for the issue. I recently bought a GTX 1060 6GB hardware and made a fresh install of ubuntu and digits4, CPU is i5 3570, with 4GB RAM.

After succesfully training mnist, I swithched to Detectnet and followed the instructions exactly to start training. Now its 24 hours and I have 5 epochs in hand, out of 30. With this speed, I am afraid it will take about 20 days, while taking just 17 hours on 1080 GPU. Memory usage is around 75% and GPU utilization varies between 0 and 70, in some cases even less, like 0-30. Batch size and accumulation is set to 3 and 7, respectively.

I appreciate any advises.