Add performance tips for modeling
Add performance tips for modeling

Co-Authored-By: astrofrog <5a30e73bb3eb7866ce4ccff234d7add82054e98d@gmail.com>
StuartLittlefair/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,bsipocz/astropy,MSeifert04/astropy,stargaser/astropy,pllim/astropy,stargaser/astropy,dhomeier/astropy,pllim/astropy,lpsinger/astropy,MSeifert04/astropy,astropy/astropy,StuartLittlefair/astropy,bsipocz/astropy,dhomeier/astropy,mhvk/astropy,saimn/astropy,stargaser/astropy,saimn/astropy,aleksandr-bakanov/astropy,saimn/astropy,larrybradley/astropy,dhomeier/astropy,lpsinger/astropy,larrybradley/astropy,astropy/astropy,lpsinger/astropy,dhomeier/astropy,astropy/astropy,aleksandr-bakanov/astropy,pllim/astropy,stargaser/astropy,MSeifert04/astropy,dhomeier/astropy,astropy/astropy,astropy/astropy,lpsinger/astropy,StuartLittlefair/astropy,saimn/astropy,StuartLittlefair/astropy,bsipocz/astropy,StuartLittlefair/astropy,pllim/astropy,mhvk/astropy,pllim/astropy,mhvk/astropy,lpsinger/astropy,larrybradley/astropy,mhvk/astropy