theorically, indeed.
But it's still my current ps4 configuration.
How can you be sure it has nothing to do with current situation ?
Because Destiny 2 is a Pro-enabled game, it is already using all available Pro resources.
Boost Mode is only for non-Pro-enabled games and only uses the full CPU, and half of the GPU resources.
Boost Mode on or off, it literally doesn't affect Pro-enabled software.
Some people seem to be misunderstanding Boost Mode and thinking it applies to Pro software. How can Boost Mode provide more resources to a Pro game when a Pro game is literally using more hardware than Boost Mode gives access to?
There'll be a flag in the OS that Boost Mode doesn't apply when playing Pro software, regardless of whether it's ticked on or not.
Mentioning you have Boost Mode on is literally irrelevant. You may as well specify you have your sound set to LPCM rather than Dolby or DTS for how irrelevant it is.