Strange. I'd expect you to be hitting at least 40-50fps on 1080 High settings in R6 Siege with those specs. Minimum system requirements for R6 Siege is an i3. Maybe because its a laptop you are either hitting thermal limits or you have significantly less VRAM than the desktop counterpart.
> Minimum system requirements for R6 Siege is an i3.
I've never played R6 Siege and have no idea how it performs, but I would just like to say that this is effectively meaningless and I hate how games put it in their system requirements. Writing "moderately fast CPU" would carry more useful information. A Westmere Core i3-530 from 2010 is not going to perform anything like a Coffee Lake Core i3-8100B from 2018.