Tor Browser requires discrete graphics on my Mac

I have around 20 GUI apps running at the moment, including Firefox, Chrome and Safari. According to Activity Monitor, only Tor requires the discrete graphics card (for displaying Facebook). Why is that? It takes a lot of energy, causes the fan to spin etc.

Trac:
Username: lg

added component::applications/tor browser owner::tbb-team priority::medium reporter::lg severity::normal status::needs-information type::defect labels

Thank you for reporting this problem. I am not sure what is the root cause; please provide some more information so we can investigate this problem:

• What version of Tor Browser are you using?
• Does the problem occur on all Facebook pages? Can you provide an URL where we can experience this problem ourselves? (we can log into Facebook if that is required)
• Is there video content on the Facebook page?
• Have you noticed the same problem on other websites?

Trac:
Component: - Select a component to Applications/Tor Browser
Status: new to needs_information
Owner: N/A to tbb-team
Version: Tor: unspecified to N/A

1. Version 8.0.6 2-3. It happens on my main feed page. There might be video there, at least below the visible portion.
2. No, but I haven't tried.

Trac:
Username: lg

Replying to lg:

1. Version 8.0.6 2-3. It happens on my main feed page. There might be video there, at least below the visible portion.
2. No, but I haven't tried.

Could you try that and report back websites where you hit this problem? That makes it possible for us to reproduce and fix your problem.

moved to tpo/applications/tor-browser#29807 (closed)