Here is the output of some debug commands to help with analysis.
0:095> !heapstat
Heap Gen0 Gen1 Gen2 LOH
Heap0 155817712 74473736 53146904 1564128
Heap1 61062208 75459328 50622408 2064936
Heap2 58532496 76780160 52072984 4327512
Heap3 65197400 77626552 48756976 655704