Performance degrading Issues on Sparse Texture

Hello, i’m creating a test program using as reference the apitest code on github: https://github.com/nvMcJohn/apitest

I’m experiencing issues on nvidia linux driver when allocating storage for sparse texture, using the sparse texture bindless approach.
I’m using the GL_RGBA8 texture format and the call to glTexStorage3D of the sparse texture lasts too much (even 20 seconds) increasing width, height and slices parameters.
Using compressed format of the example there are no issues.
On Windows platfrom there are no issues at all even using width, height and slices set to 2048.

Test Hardware: Nvidia GTX 750M (Optimus)
Linux Platform: Arch Linux Kernel 4.1.6, Nvidia Driver 352.41
Windows Platform: Windows 8.1, Nvidia Driver 355.60