Mental bandwidth refers to your brain's capacity or ability to focus on and process information. It is like the amount of mental energy you have available for thinking, making decisions, and solving problems. Full definition
Ultimately, being mentally tough comes down to not wasting your precious mental bandwidth on things out of your control and that doesn't serve your vision. (inc.com)
That often doesn't leave a lot of mental bandwidth for thinking things through or making thoughtful long - term plans. (inc.com)
And they found that calling was a challenge, but that corresponding requires serious mental bandwidth, even without the use of fingers. (scientificamerican.com)