mreadtim = sreadtim
===================
        ID HASH_BLOCKS    HASH_KB TOTAL_COST  HASH_COST      DELTA
---------- ----------- ---------- ---------- ---------- ----------
         5          69        552       1072        560       -189	158	127	 95	-- 31
        19          83        664        927        415       -106	 89	 71	 55	-- 18
        33          97        776        831        319        -65	 56	 47	 37	--  9
        46         110        880        763        251        -44	 38	 32	 26	--  6
        60         124        992        711        199        -30	 26	 23	 20	--  3
        74         138       1104        671        159        -21	 26 	 17	 16
        87         151       1208        640        128        -15	 19	 14	 14
       101         165       1320        613        101        -11	 11	 11	 11
       115         179       1432        591         79         -8	  9	 10	 10

mreadtim = 2 * sreadtim
=======================
        ID HASH_BLOCKS    HASH_KB TOTAL_COST  HASH_COST      DELTA
---------- ----------- ---------- ---------- ---------- ----------
         5          69        552       1876        856       -158
        19          83        664       1727        707        -89
        33          97        776       1618        598        -56
        46         110        880       1535        515        -38
        60         124        992       1463        443        -26
        74         138       1104       1400        380        -19
        87         151       1208       1346        326        -15
       101         165       1320       1295        275        -11
       115         179       1432       1247        227         -9

mreadtim = 3 * sreadtim
=======================
         5          69        552       2680       1660       -127
        19          83        664       2528       1508        -71
        33          97        776       2406       1386        -47
        46         110        880       2307       1287        -32
        60         124        992       2214       1194        -23
        74         138       1104       2129       1109        -17
        87         151       1208       2053       1033        -14
       101         165       1320       1976        956        -11
       115         179       1432       1902        882        -10

mreadtim = 4 * sreadtim
=======================
         5          69        552       3485       2465        -95
        19          83        664       3328       2308        -55
        33          97        776       3194       2174        -37
        46         110        880       3079       2059        -26
        60         124        992       2965       1945        -20
        74         138       1104       2858       1838        -16
        87         151       1208       2759       1739        -14
       101         165       1320       2657       1637        -11
       115         179       1432       2558       1538        -10




Odd note:
---------
The delta is every 112KB (roughly).
mbrc = 6.59
build = 255 fragments
probe = 1269 fragments

(1269 + 255) * 8KB / 112KB = 108.8