load averageが数日前から悪化

2009-11-12のレスポンス悪化以後、ずっと調子の良かった使えるねっとＶＰＳサーバーですが、数日前からload averageの値がやや悪化しています。
プロキオン通販案内と通販商品ナビ・Flashバージョンのアクセス件数はずっと横ばい状態なので、VPSサーバーの負荷が大きくなっているかもしれません。
今後の備忘録として数日間のload averageのログを記録しておきます。
１分平均0.5以上を抜き出しています。

04:05:02 up 115 days, 16:47,  0 users,  load average: 0.84, 0.43, 0.16
21:45:01 up 116 days, 10:27,  3 users,  load average: 0.72, 0.62, 0.28
21:50:02 up 116 days, 10:32,  3 users,  load average: 0.58, 0.60, 0.35
21:55:01 up 116 days, 10:37,  3 users,  load average: 0.64, 0.75, 0.48
22:00:01 up 116 days, 10:42,  3 users,  load average: 1.21, 0.82, 0.55
22:05:01 up 116 days, 10:47,  3 users,  load average: 1.12, 0.99, 0.69
04:05:01 up 116 days, 16:47,  0 users,  load average: 0.98, 0.47, 0.17
05:40:01 up 116 days, 18:22,  0 users,  load average: 0.67, 0.35, 0.13
22:50:04 up 117 days, 11:32,  3 users,  load average: 1.04, 0.44, 0.15
23:10:01 up 117 days, 11:52,  3 users,  load average: 0.97, 0.68, 0.44
23:15:01 up 117 days, 11:57,  3 users,  load average: 1.08, 0.93, 0.61
01:30:05 up 117 days, 14:12,  0 users,  load average: 0.65, 0.23, 0.09
04:05:01 up 117 days, 16:47,  0 users,  load average: 0.95, 0.54, 0.23
04:05:02 up 118 days, 16:47,  0 users,  load average: 0.97, 0.46, 0.17
09:55:01 up 118 days, 22:37,  3 users,  load average: 0.63, 0.49, 0.31
10:15:06 up 118 days, 22:57,  3 users,  load average: 0.55, 0.22, 0.19
10:30:06 up 118 days, 23:12,  3 users,  load average: 1.18, 0.72, 0.38
12:55:01 up 119 days,  1:37,  3 users,  load average: 0.82, 0.55, 0.27
21:30:03 up 119 days, 10:12,  3 users,  load average: 0.62, 0.18, 0.05
21:35:01 up 119 days, 10:17,  3 users,  load average: 0.56, 0.54, 0.25
21:50:04 up 119 days, 10:32,  3 users,  load average: 1.05, 0.88, 0.55
21:55:01 up 119 days, 10:37,  3 users,  load average: 0.55, 0.88, 0.64
04:05:02 up 119 days, 16:47,  0 users,  load average: 1.22, 0.57, 0.22
04:40:04 up 119 days, 17:22,  0 users,  load average: 0.53, 0.32, 0.21
05:05:08 up 119 days, 17:47,  0 users,  load average: 0.72, 0.43, 0.28
05:25:01 up 119 days, 18:07,  0 users,  load average: 0.51, 0.36, 0.26
06:20:02 up 119 days, 19:02,  3 users,  load average: 0.68, 0.34, 0.21
06:40:01 up 119 days, 19:22,  3 users,  load average: 0.53, 0.62, 0.36
10:20:04 up 119 days, 23:02,  3 users,  load average: 0.54, 0.19, 0.11
12:55:02 up 120 days,  1:37,  3 users,  load average: 0.56, 0.28, 0.12
14:50:03 up 120 days,  3:32,  3 users,  load average: 0.71, 0.47, 0.25
20:00:04 up 120 days,  8:42,  3 users,  load average: 0.66, 0.22, 0.12
21:25:01 up 120 days, 10:07,  3 users,  load average: 0.74, 0.43, 0.16
21:30:04 up 120 days, 10:12,  3 users,  load average: 0.67, 0.58, 0.29
21:40:01 up 120 days, 10:22,  3 users,  load average: 1.09, 0.82, 0.50
03:30:04 up 120 days, 16:12,  0 users,  load average: 0.58, 0.18, 0.11
04:05:02 up 120 days, 16:47,  0 users,  load average: 1.16, 0.54, 0.21
04:35:02 up 120 days, 17:17,  0 users,  load average: 0.50, 0.19, 0.19
08:15:04 up 120 days, 20:57,  3 users,  load average: 0.56, 0.31, 0.15
08:25:02 up 120 days, 21:07,  3 users,  load average: 0.92, 0.58, 0.33
08:35:09 up 120 days, 21:17,  3 users,  load average: 0.54, 0.33, 0.29
11:05:01 up 120 days, 23:47,  3 users,  load average: 0.58, 0.23, 0.09
13:20:05 up 121 days,  2:02,  4 users,  load average: 0.52, 0.23, 0.12
13:25:05 up 121 days,  2:07,  4 users,  load average: 1.13, 1.05, 0.52
13:30:03 up 121 days,  2:12,  4 users,  load average: 1.23, 1.17, 0.71
13:35:01 up 121 days,  2:17,  4 users,  load average: 0.60, 1.08, 0.81
21:20:03 up 121 days, 10:02,  3 users,  load average: 0.61, 0.38, 0.17
21:25:01 up 121 days, 10:07,  3 users,  load average: 1.43, 1.04, 0.51
21:30:04 up 121 days, 10:12,  3 users,  load average: 0.59, 0.70, 0.51
21:40:01 up 121 days, 10:22,  3 users,  load average: 1.11, 0.77, 0.58
21:45:01 up 121 days, 10:27,  3 users,  load average: 1.11, 1.01, 0.73
01:25:05 up 121 days, 14:07,  0 users,  load average: 0.55, 0.19, 0.12
03:00:06 up 121 days, 15:42,  0 users,  load average: 0.68, 0.37, 0.26
03:50:03 up 121 days, 16:32,  0 users,  load average: 0.60, 0.19, 0.16
04:05:07 up 121 days, 16:47,  0 users,  load average: 1.04, 0.54, 0.29
06:00:01 up 121 days, 18:42,  1 user,  load average: 0.52, 0.38, 0.29
06:05:01 up 121 days, 18:47,  3 users,  load average: 0.60, 0.65, 0.43
15:55:01 up 122 days,  4:37,  3 users,  load average: 0.68, 0.21, 0.06
17:55:01 up 122 days,  6:37,  3 users,  load average: 0.60, 1.30, 0.67
21:25:01 up 122 days, 10:07,  3 users,  load average: 1.10, 0.58, 0.26
21:30:01 up 122 days, 10:12,  3 users,  load average: 0.50, 0.55, 0.33
21:35:03 up 122 days, 10:17,  3 users,  load average: 0.68, 0.56, 0.38
21:40:04 up 122 days, 10:22,  3 users,  load average: 0.56, 0.71, 0.52
21:45:01 up 122 days, 10:27,  3 users,  load average: 1.21, 0.95, 0.66
01:35:03 up 122 days, 14:17,  0 users,  load average: 0.74, 0.29, 0.11
04:05:01 up 122 days, 16:47,  0 users,  load average: 0.95, 0.45, 0.17
12:30:05 up 123 days,  1:12,  3 users,  load average: 0.65, 0.83, 0.39
17:15:03 up 123 days,  5:57,  3 users,  load average: 0.61, 0.18, 0.06
22:00:01 up 123 days, 10:42,  3 users,  load average: 0.87, 0.38, 0.14
22:15:01 up 123 days, 10:57,  3 users,  load average: 0.77, 0.64, 0.41
22:20:01 up 123 days, 11:02,  3 users,  load average: 1.17, 0.80, 0.51
22:25:01 up 123 days, 11:07,  3 users,  load average: 1.12, 1.03, 0.68
03:55:01 up 123 days, 16:37,  0 users,  load average: 0.62, 0.21, 0.06
04:05:01 up 123 days, 16:47,  0 users,  load average: 1.00, 0.59, 0.26
07:30:03 up 123 days, 20:12,  3 users,  load average: 0.80, 0.45, 0.17
19:30:07 up 124 days,  8:12,  3 users,  load average: 0.55, 0.15, 0.04
21:30:01 up 124 days, 10:12,  3 users,  load average: 1.23, 0.77, 0.43
21:35:01 up 124 days, 10:17,  3 users,  load average: 0.88, 0.92, 0.58
04:05:01 up 124 days, 16:47,  0 users,  load average: 0.96, 0.47, 0.17

４日前(120 days)あたりからload averageが0.5を超える回数が増えだしてます。