15" mid 2015 instantly fills integrated video memory with HiDPI mode on

[Moda20]

I am having some issues with my newly acquired MacBook pro 15. the model is mid-2015 with 16GB RAM, an Intel(R) Core(TM) i7-4980HQ CPU @ 2.80GHz and AMD R9 graphics.

i use it for developing and I use the IntelliJ IDEs, the problem is those fill my video memory very very fast and the entire Os will start lagging and feel less responsive on multiple occasions while offloading memory pages to the SSD. I am running in HiDPI mode, which renders in higher resolution and then scale down, but it's just a 1920x1200 HiDPI resolution, is that enough to overwhelm the IGPU allocated memory?

is there a way to give more memory to the IGPU? it does only have a 1536Mb.

Also, isn't this exactly how the MacBook supposed to work as of apple's configuration? am I pushing the laptop a lot?

 

[Fuchal]

I'm don't think this has to do with video memory, but that the 2015 MacBook Pro is going on 6 years old and the integrated graphics are pretty slow by today's standards. Personally, even a year or two ago my 2015 MBP felt sluggish when using the integrated GPU.

 

[Moda20]

they are slow by todays standards but I am not doing anything that can't do on other laptops from 2015 too.
that's what bothering me.