Ok, fine

I uninstalled any non-official GNOME extension and in cold start I'm getting after 1.2h of uptime 200MB more than the normal, I am not 100% sure but I think this still persist

Cold start:
 +-----------------------------------------------------------------------------+
| NVIDIA-SMI 418.56       Driver Version: 418.56       CUDA Version: 10.1     |
|-------------------------------+----------------------+----------------------+
| 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 106...  Off  | 00000000:1C:00.0  On |                  N/A |
| 51%   30C    P0    28W / 120W |    225MiB /  3011MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0      1501      G   /usr/lib/xorg/Xorg                            18MiB |
|    0      1559      G   /usr/bin/gnome-shell                          49MiB |
|    0      2017      G   /usr/lib/xorg/Xorg                            44MiB |
|    0      2154      G   /usr/bin/gnome-shell                         109MiB |
+-----------------------------------------------------------------------------+

1.2h of uptime

Mon Apr  8 13:53:34 2019       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 418.56       Driver Version: 418.56       CUDA Version: 10.1     |
|-------------------------------+----------------------+----------------------+
| 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 106...  Off  | 00000000:1C:00.0  On |                  N/A |
| 55%   33C    P8     9W / 120W |    447MiB /  3011MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0      1501      G   /usr/lib/xorg/Xorg                            18MiB |
|    0      1559      G   /usr/bin/gnome-shell                          49MiB |
|    0      2017      G   /usr/lib/xorg/Xorg                           124MiB |
|    0      2154      G   /usr/bin/gnome-shell                         204MiB |
|    0      7639      G   ...quest-channel-token=9204719934798504613    46MiB |
+-----------------------------------------------------------------------------+