I see the same behaviour when e.g. installing another in os in a vmware virtual 
machine. CPU is basically in disk wait and the system is not really usable. 
Renicing the vmware process does not change the behaviour.
i...@xxx$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 7  3      0  36164   7968 594560    0    0    43    43   94   96  7  4 88  1
 0  9      0  27400   8036 599996    0    0  2664  4980 1598 3157  6 27  0 67
 0  8      0  43424   7884 587740    0    0   440  5584 1600 2378  8 11  0 82
 1  9      0  47196   7580 582288    0    0   128 10892 1565 2338  8  8  0 85
 3 12      0  45744   7480 579288    0    0   232 20928 1378 1981  2  6  0 92
 0 12      0  58072   7096 565888    0    0     0  5836 1236 1833  2  5  0 94
 1 11      0  58280   7048 563256    0    0     0 14056 1344 1932  3  7  0 90
 2 12      0  59840   6868 557920    0    0     4 14204 1338 1846  0 11  0 89
 0 13      0  64976   6796 552776    0    0     0  5704 1411 1935  3  4  0 94
 1 14      0  65468   6740 547764    0    0   184 18820 1248 1856  3 13  0 84
 0 14      0  68940   6688 540408    0    0     0 16788 1346 1929  1 14  0 85
 0 16      0  87328   6572 524068    0    0   112 11972 1161 1591  2  9  0 90
 0 16      0 100124   6480 511072    0    0    80 10088 1133 1556  7 15  0 79
 0 16      0 101556   6364 508088    0    0     0  9908 1188 1646  2  4  0 95
 0 16      0 100756   6296 506024    0    0     0 15768 1245 1696  2  6  0 93
 0 16      0 101104   6252 503888    0    0     0 10740 1272 1630  3  7  0 91
 0 16      0 106876   6228 496680    0    0     0 11532 1188 1549  7 15  0 78

-- 
Random access read speed from encrypted device is very slow compared with other 
linux distributions
https://bugs.launchpad.net/bugs/363763
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