Set font size

hi

i know this seems to be very simple but i want to know how to set font size in table cell

and one more thig when i prepared a presentation through code it is very slow when compared to aspose.cells and slides, when i use pres.write("file name"); may i know the reason

Did you read Manage Text chapter in Developer Guide?
Each table’s cell is a rectangle with TextFrame inside so there is no any differencies with usual shapes.
Also you can find detailed code examples in the Northwind demo sources.

That’s not right to compare Aspose.Slides with Aspose.Cells.
The first one works with images and graphics but the second one with data and text only.
I don’t think 1 or 2 seconds is too much for opening average presentations.