为什么我的网延迟这么多~~~

问题描述：

我们14家一起用的两根ADSL 一根是2M，一根是1M，用TENDA TEL480T+的双WAN口路由器~~~可是为什么网速这么慢呢~~~不管是多少人在线的时候都一样~~~
Microsoft Windows XP [版本 5.1.2600]
(C) 版权所有 1985-2001 Microsoft Corp.

C:\ >ping www.baidu.com -t

Pinging www.a.shifen.com [220.181.38.4] with 32 bytes of data:

Reply from 220.181.38.4: bytes=32 time=740ms TTL=52
Reply from 220.181.38.4: bytes=32 time=739ms TTL=52
Reply from 220.181.38.4: bytes=32 time=746ms TTL=52
Reply from 220.181.38.4: bytes=32 time=726ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1130ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1131ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1318ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1328ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1504ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1200ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1117ms TTL=52
Reply from 220.181.38.4: bytes=32 time=946ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1024ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1157ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1264ms TTL=52
Reply from 220.181.38.4: bytes=32 time=1011ms TTL=52
Reply from 220.181.38.4: bytes=32 time=847ms TTL=52
Reply from 220.181.38.4: bytes=32 time=971ms TTL=52

Ping statistics for 220.181.38.4:
Packets: Sent = 80, Received = 79, Lost = 1 (1% loss),
Approximate round trip times in milli-seconds:
Minimum = 332ms, Maximum = 1504ms, Average = 922ms
Control-C
^C
C:\ >
昨天刚像这样组成的局域网~~~
一组成这样，网络不稳~~~网速慢延迟多~~~

问题解答：

假如和以前相比慢的话，杀毒