Operation too slow

slow_scan

{
  "processingtimems": 25255,
  "client": "172.22.4.5:56750",
  "timeRange     ": [
    0,
    9223372036854775807
  ],
  "starttimems": 1335310563560,
  "responsesize": 0,
  "class": "HRegionServer",
  "cacheBlocks": true,
  "table": "userprofile",
  "families": {
    "data": [
      "ALL"
    ]
  },
  "batch": -1,
  "startRow": "",
  "queuetimems": 0,
  "stopRow": "",
  "method": "openScanner",
  "totalColumns": 1,
  "maxVersions": 1,
  "caching": 50
}