Extremely slow rebuilds

shell-output

kavit:policy$ ember build
version: 0.0.39
Built project successfully. Stored in "dist/".
kavit:policy$ ember s
version: 0.0.39
Livereload server on port 35729
Serving on http://0.0.0.0:4200

Build successful - 4537ms.

Slowest Trees                  | Total          
-------------------------------+----------------
TreeMerger (vendor)            | 925ms          
TreeMerger (appAndDependencies) | 864ms          
TreeMerger (stylesAndVendor)   | 837ms          
StaticCompiler                 | 685ms          
moveFile - notificationsFile   | 296ms          

file changed templates/application.hbs

Build successful - 8691ms.
... Reload LiveReload files ...

Slowest Trees                  | Total          
-------------------------------+----------------
TreeMerger (vendor)            | 2239ms         
StaticCompiler                 | 1732ms         
TreeMerger (appAndDependencies) | 1642ms         
TreeMerger (stylesAndVendor)   | 1516ms         

file changed templates/application.hbs

Build successful - 9424ms.
... Reload LiveReload files ...

Slowest Trees                  | Total          
-------------------------------+----------------
TreeMerger (appAndDependencies) | 3678ms         
TreeMerger (vendor)            | 1573ms         
TreeMerger (stylesAndVendor)   | 1520ms         
StaticCompiler                 | 1472ms