N810 slow since rebooting

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My N810 seems really slow since yesterday. It had run down (nothing unusual there) and after I recharged it it seemed to run very slow. I wondered if it was short on space in /, so I deleted some files and regained several Mb, but that did not help. I had been suspicious of the battery, which did not seem to keep as much charge as when new, and did not run the SD card properly when at low charge (maemo-mapper reports unable to write map database), so I bought a new battery. It is still slow: sometimes it will not respond to menu taps, or the system menu is not shown.

I am seeing:
$ free
              total         used         free       shared      buffers
  Mem:       126796       124944         1852            0           60
 Swap:       131064       107480        23584
Total:       257860       232424        25436

$top (by CPU)
Mem: 124592K used, 2204K free, 0K shrd, 60K buff, 3552K cached
Load average: 5.10 5.46 3.90
  PID USER     STATUS   VSZ  PPID %CPU %MEM COMMAND
  289 root     SW<        0     6  3.9  0.0 kondemand/0
  119 root     SW<        0     6  2.1  0.0 kswapd0
 1752 user     RW      1960  1437  1.9  1.5 top
...
(by memory)
  PID USER     STATUS   VSZ  PPID %CPU %MEM COMMAND
 1303 user     DW      128M   354  0.0103.4 alarmd
 1451 user     SW     87992     1  0.0 69.2 maemo-mapper
 1399 user     DW     67292  1383  0.0 52.9 browserd
 1383 user     SW     40104     1  0.0 31.5 browserd
 1042 user     DW<    38852  1012  0.0 30.5 maemo-launcher
...

There are no unusual user tasks running - no memory/CPU hogs that I am aware of.

I cannot remember what is normal, e.g. if it is usual for alarmd to show such a large virtual size.

I have tried rebooting several times, and power-cycling by removing the battery, but it is still slow.

Any suggestions ?

--
Andrew Daviel, TRIUMF, Canada
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