Even though Tabulizer does not impose any limits on how large your table can be, your system (web server) does. So, as the table grows larger and larger eventually you will run out of memory or CPU power. For instance, the data source cache along with the server side feature makes possible to load only the part of the table that's really needed.
For this reason, Tabulizer is using some smart techniques to improve the performance of your tables (loading time, etc) so you can have really large tables, with up tp 50,000 rows, assuming of course that the row size is not very large and you do have enough PHP memory (758MB or more) and available max execution time (over 2 minutes).
See in action how Tabulizer handle a large table by visiting the demo page