I have noticed that a few days before an update my mac slows way down

Most of the time I have no issues with performance, but there are times my laptop becomes slow, almost unresponsive, at times even if it is just typing information in an input line (safari, mail, even in word). This could be my imagination but it seems that the worst times are right before an update drops (I have noticed this the last half a dozen times). Recently, in that has been slow off and on for a couple of weeks - and today was particularly bad - and then voila an update became available. Does anyone else notice this? Is there a possible explanation? Does the OS communicate back to corporate servers in background? I was running Ventura 13.2 and is updating now to 13.3.