On your message, there can be various MS updates. Some larger than others. If you decide to postpone or decline all you do is que them for a later time. The more you do this the more likley they stack-up and start a hinderance, not a slowing of the PC but rather pop-ups from time to time. You can defeat this by your PC setup under the "automatic update" to disable that. You can also visit the MS update website and see what your PC needs and if there a large amount, then you know what wants to be installed. You don't really want to delay this as many are security type updates or patches important to the OS. Use the "update button" after clicking on "start" to check at MS website. Beware, once an update is actually installed, it will want or may ask for a reboot and don't at that time, simply shuut-OFF the PC, wait until done. t should prompt you during that time.
What may have happened is the tech during the installs, "enabled" the automatic update service and now you see this. It may have been a service/favor as they can be numerous and didn't turn it OFF..