I only use var_dump functionality from xdebug extension.
I have set php.ini to xdebug.mode = develop.
But develop mode slows the whole application (I am assuming it enables a lot more features other than just var_dump).
Is it possible to enable only var_dump feature and disable all the rest of the features from Xdebug extension?
No, that is not possible. However, you can set
xdebug.mode=offand call it asxdebug_var_dump()instead.