We can't predict if technological advancement has any upper limits because we can't predict what scientific research will discover.

And the rate of technological advancement is dependent on what some economist call "general technologies", that is technological innovations that open up a huge swath of less generalized technologies. The 20th century was marked by a much more rapid technological development that prior centuries because of the 19th century technological innovations of electric power and internal combustion engines which led to a huge boom in other technologies that utilized electricity or had internal combustion engines (or both). The last big general technology developed was computers which open up a lot of other tech possibilities ... but computer tech has never been as generalized as the other two.