8x slower download speed than Windows laptop on cable

I have cable internet (in Luxembourg). The provider uses Scientific Atlanta EPC2100R2 modems. Download speed is around 1 Mbps, rather than the 8 Mbps advertised. When technicians come to investigate, the connection is 8 Mbps on their Windows laptop. They claim to have several clients on Macs, and none have the problem.
My modems also get fried very often. The provider had to replace my modem twice in four months.
The problem persisted after I replaced my iMac. It may be a software issue, though, as I migrated my old Mac to the new one.
My Mac works fine with ADSL. I haven't tried it with other cable providers.
What can I do? I tried creating new locations in Network preferences, to no avail. Always the same result.

wireless is unreliable for the speedtest as it varies depending on home conditions so only way accpeted is by cable.  if that also shows a problem then you can take it from there
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    If you like a post, or want to say thanks for a helpful answer, please click on the Ratings star on the left-hand side of the post.
    If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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    ns558                   4224  0
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    psmouse                34952  0
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    parport                31176  3 ppdev,lp,parport_pc
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    rtc_proc                3844  0
    rtc_dev                 6664  0
    rtc_cmos                7188  0
    rtc_core                7684  4 rtc_sysfs,rtc_proc,rtc_dev,rtc_cmos
    rtc_lib                 3456  2 rtc_sysfs,rtc_core
    k8temp                  4736  0
    pcspkr                  2944  0
    usbhid                 36128  0
    hid                    24448  1 usbhid
    ff_memless              5256  1 usbhid
    sg                     26524  0
    i2c_nforce2             5120  0
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    tsdev                   6464  0
    evdev                   8192  0
    thermal                11528  0
    fan                     3972  0
    button                  6288  0
    battery                 8452  0
    ac                      4100  0
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    snd_mpu401              6760  0
    snd_mpu401_uart         7040  1 snd_mpu401
    snd_rawmidi            19104  1 snd_mpu401_uart
    snd_seq_oss            29056  0
    snd_seq_midi_event      6528  1 snd_seq_oss
    snd_seq                46544  4 snd_seq_oss,snd_seq_midi_event
    snd_seq_device          6796  3 snd_rawmidi,snd_seq_oss,snd_seq
    snd_pcm_oss            38688  0
    snd_pcm                69124  4 snd_intel8x0,snd_ac97_codec,snd_pcm_oss
    snd_timer              19076  3 snd_seq,snd_pcm
    snd_page_alloc          7816  2 snd_intel8x0,snd_pcm
    snd_mixer_oss          14592  1 snd_pcm_oss
    snd                    44516  14 snd_intel8x0,snd_ac97_codec,snd_mpu401,snd_mpu401_uart,snd_rawmidi,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_pcm,snd_timer,snd_mixer_oss
    soundcore               6368  1 snd
    ac97_bus                2432  1 snd_ac97_codec
    slhc                    5760  1 ppp_generic
    forcedeth              42888  0
    powernow_k8            12948  0
    freq_table              3984  2 cpufreq_ondemand,powernow_k8
    processor              24532  2 thermal,powernow_k8
    ext3                  119176  1
    jbd                    54312  1 ext3
    mbcache                 6916  1 ext3
    sd_mod                 17796  3
    sr_mod                 14372  0
    cdrom                  34464  1 sr_mod
    ehci_hcd               30732  0
    ohci_hcd               19588  0
    usbcore               111240  4 usbhid,ehci_hcd,ohci_hcd
    sata_nv                15748  2
    ata_generic             5636  0
    pata_amd               10380  0
    libata                103060  3 sata_nv,ata_generic,

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