Of course, you cannot ask Magento to perform that kind of thing on inadequate hosting, which is what it normally comes down to.
Is there a particular reason you posted the question multiple times even though the answer was already given, hosting (and a distant second a clean install or trying to switch off all extensions). We guess you are on shared hosting, it is logical that it performs a retrieval of all products for association in admin. You cannot expect people to use their time looking at something that is standard Magento, caused by your overusing the system without providing it the resources to run, and the fact that you don't like the answer given even though it is the correct one. It is unreasonable.
Magento Bundles (Long MYSQL Query)
Insanity: doing the same thing over and over again and expecting different results. - Albert Einstein