From Price The Spitfire Story (Haynes, 2010, p. 106) - Spitfire I N3171 with the CSP was tested in March 1940, and wasn't fitted with armour plating, and IFF; the CSP was heavier than the two-pitch, by about 115 lb, so this and the other added weight would have pulled back climb performance, as described by ATAG_Dutch
The main benefits of the CSP were a greatly improved take-off distance (Two pitch: T/O 320yds, 490 yds to clear 50 ft screen versus 225 yds, and 370 yds respectively). It also meant the pilot didn't have to remember to change the pitch settings, and there was less strain on the engine.
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