java - Does having multiple class files in android app slow down the app? -

am not sure if i'll able capture essence of doubt, i'll give try anyway!
doubt creating lightweight android apps. read few sites , commonly talk using layouts judiciously(and passing objects , other things). no 1 ever made clear if number of class directly proportionally causing app lag down? understand using multiple class send class objects , them cause lag sake of modularity doing so!

one such place passing control login button's onclick class process connectivity , starting new activity without freezing app.
(i know isn't right way still sake of example.)
here i'll sending context of activity different class!
can sum doubts 2 questions-
1. multiple java classes slow down app(and @ range keep them)?
2.and passing context take amount of memory passing ordinary object?
p.s link question performance creating lightweight app - tips lightweight android applications
feed appreciated! thanks!