saving dxf why lines

hi all again i have had some really good help from you on here things i didnt know like dissolving text and fit splines really speeds up things

but when i save a part to dxf i get nothing but streight lines thats after dissolve text and fit to spline a circle is one entity where as an oval is

hundreds of lines joined why would a circle be one and ovel be lots i export this to a program curve cut whitch saves it as g code

please have a look at the file i sent i did some fit to spline but the small text is just a mess

thank you all

SolidworksImport export