[Opensymphony-oscache] Getting is much lower than putting on oscache ,why?

I just do a test focus on put/get/remoe on oscache.In the test,I put 100000 objects in LRUCache,the time consumed as following :
LRU cache time put = 1062 ms
LRU cache time get = 1102(Sometimes reach 1051) ms
LRU cache time remove = 240 ms
While map :
map time put = 661 ms
map time get = 121 ms
map time remove = 110 ms

Resonablly the getting is much faster than putting,however,you see,why?What's the matter?I eager  to know ?
Notes,the testing circumstance:JDK1.4.2+window server 2000+OSCache 2.1

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