Insync directly using GPU memory on linux?

insync is the only application on my machine besides xorg and google-chrome that directly uses nvidia gpu memory. This is very weird and seems unnecessary! What is going on with this?

Tue Oct 16 19:49:39 2018       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 410.48                 Driver Version: 410.48                    |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 108...  Off  | 00000000:02:00.0  On |                  N/A |
| 29%   28C    P8     9W / 250W |    241MiB / 11177MiB |      1%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0      1138      G   /usr/lib/xorg/Xorg                           167MiB |
|    0      1787      G   ./insync                                       7MiB |
|    0      2151      G   ...quest-channel-token=2962953799856845648    64MiB |
+-----------------------------------------------------------------------------+

Hi! As per our engineer-- we use Qt5, and the QtWebEngine will use the GPU when available.