What are you worrying about, the draw time or the time it takes to retrieve the data?
AFAIK all data for a record is retrieved when you view that record, it doesn't matter if some of the fields are shown on different tabs.
What will significantly slow down the 'display' of the data is how long it takes Access to retrieve the data and this is a factor of the number of records, the database structure and any queries being run; although the processor speed and RAM will have some impact. So, if you have a slow computer and a large database it will take more time for the data to be displayed. Once the data on the first tab is displayed though the data for the controls on the other tabs should already be available for when you switch to them (unless of course you have code running new queries when you switch to them, thus introducing more delays...).
If you're worried about the draw time, get a faster computer with more RAM, if you are worried about the retrieval time take care in how you design your database.
Tim