if u have a big project, problem with it is that it might glitch
No, it won't glitch as long as you make sure that there is only one instance of this object.
is transparent and everytime u fetch 1 variable the gpu trying to render that sprite which uses a little bit more resources in spikes... and if u fetch consequencely 10-20-50 variables from that sprite ur game will have a spike "load freeze" on read/write data.
I don't think this is true.
The sprite is invisible and off-screen, so it's not consuming any GPU or CPU resources.