You need to make a Speedpak configuration of the assemblies you are using. It lightens enormously. So to be tested for your application.
If you don't know, it allows you to have a version of an assembly that is only an image, except for a few components or faces that you will have selected.
Ouch, another problem, following your answers, I absolutely don't understand why but the option "Set solved parts to light" doesn't exist in my menus, only the opposite... Meme by customizing the menu!!
However, in the SW help, it is said that a simple right click on a part / assembly / sub-assembly gives access to the option "Set solved parts to lightened"... Nothing to do about it...
@Frederic, yes, even trying with the higher-level assembly.
@Benoit LF, yes, yes, indeed, I'm going to try to reset my settings.
@gt22, I've never used this famous blocking bar, I didn't use it until now but it seems to me a good alternative if it also has the effect of lightening the parts. If it only serves to block my coins and does not free up any resources, I admit that this is not exactly what I am looking for.
In any case, thank you for your answers, I don't know which one to choose then^^
@gt22: Well, it's a shame, the blocking bar doesn't work at home... Well, not quite, it works on all my parts, all my assemblies, except the heaviest, the one I work on mainly which takes all my memory and makes my problem appear!!
I rummaged around a bit, nothing to do, the option is checked, but the bar refuses to appear on this document only! I admit to being a little frustrated:(
Otherwise, I followed @Benoit's advice, in fact, I don't have to close my session when the bug is fixed, I just have to go to the process tab of the task manager and close SW there.
A small diversion of the problem (without solving it): when I first open my file, my parts are opened in light mode, it's as soon as I edit them that they go into solved mode. So, while waiting to find a solution, I only touch up my parts in a specific order to avoid overloading my memory from the beginning... It's precarious but it allows me to last a little longer...
The Speedpack option seems to me to be quite in the idea but I admit to being a little afraid of losing some data from my assembly. I'll look into it with a lighter file to make a first try!
Data loss from the SpeedPak is unlikely. In the end, it's just an additional configuration of your assembly. It's on the same level as creating a configuration and removing/disabling components.
If you have a quarter of an hour, make a take-home composition of your set by putting a prefix on all your components (no risk of polluting your original assembly) and try it out on this new set of the Speedpak.
@gt22: I'm quite inexperienced in computers and I admit I don't know the capabilities of my pc at all... I just know that my company bought it in January and that my network manager has assured me that I won't find a better graphic design.... I can't say anything more...
Registering in .sldprt is a solution that I have already tested but as @Benoit.LF says, it doesn't lighten the parts much... I admit that I don't see any obvious differences between the assembly and the part... Except that in .sldprt, I can no longer touch the structure of my building...
@Benoit.LF: I just tested the speedpack, I made a composition to take away, I defined a graphic speedpack on the building structure but I admit that I didn't expect that at all... In fact, the speedpack is only used to fade the selected bodies when approaching my mouse? If that's the case, it's not at all what I'm looking for because despite the fact that it takes much less memory, I still need to position my parts in relation to my structure, if I can no longer select the faces that interest me, I can't work anymore;)
EDIT: I admit that the fundamentals are always good to remember. I don't have anything of what you mentioned in my assembly, I abandoned the screws and symmetries very quickly, I couldn't get by anymore;)
On the other hand, for piping, it is not available on the Standard version (which I own...). And moreover, I don't think it's really up to date for the rectangular duct networks that we make entirely to measure.