Why is the Read on Rollup slow?

Some of the SID tables take a lot of time to index eventhough the volume is less. Is there any setting that need to be done?
Here is the stat of two objects for example. The first record in each set is the initial indexing. Since the volume is high the indexing time is also high. The next three records are from roll-up. When you look at the second record of each set, eventhough the records inserted are in 100K, the TIMEREAD is high, almost half of the initial fill. The third and fourth records look normal.
Any reason?
Object               TIMEREAD     TIMEFILL     TIMEOPTIMIZE     TIMECOMMIT     REC_INSERTED
/BI0/SDOC_NUMBER     636.802779     8,925.103296     213.945719     4.974381     212,420,005
/BI0/SDOC_NUMBER     292.396420     9.711254     35.937065     9.993905     96,700
/BI0/SDOC_NUMBER     2.953143     9.756517     35.447003     4.818009     60,336
/BI0/SDOC_NUMBER     2.071610     9.126111     33.582829     2.396237     33,156
/BIC/SBORGDNUM          1,053.953314     2,013.676251     304.764505     6.752824     293,281,792
/BIC/SBORGDNUM          414.273110     13.336339     54.603681     8.372419     159,261
/BIC/SBORGDNUM          3.946742     13.359297     54.428974     5.025583     86,140
/BIC/SBORGDNUM          2.668379     13.195587     53.620421     4.440632     89,084

We have conveyed the message to basis/dba team. Will update once we have more info. Thanks.

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