I'm having a ADSL 512 KBPS. But i wonder why, when i downloading a file the bandwidth is only 7 or 8 KBPS. I didn't open any application that consume bandwidth. i also verify there is no spyware or virus.
How come???

Multiple reasons, possibly unknown program taking the bandwidth. If its on a network then its possibly that its capped by the network (router/switch). That or the person sending things to you has a slow connection themselves or their bandwidth is being eaten.

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As a reminder, Most DCC problems that involve file content (possibly copyrighted as well) or remote client problems (outside of your own) will probably not be answered.
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The problem is most likely the DCC protocol, which isn't very well suited for large file transfers. If you want to download legal files, better do it with better protocols like FTP, or programs that were designed specifically for file transfers, because mIRC is not well suited for it.

I agree 100%.

However, I doubt its the protocol thats the problem. More or less its the lack of features since its an additional item added to mIRC not required for the main purpose of the client.

The limiting factor in downloading (be it with mirc, ftp, http, or whatever .. is the speed capabilities of the sender. It matters not how fast you can download if you're trying to download from a dial-up connection (or even a broadband connection that's using all their bandwidth on multiple connections).

On top of all the other information Id like to point out something, most (if not all ADSL) is listed in kiloBITS so you most likely have a ADSL 512kb/ps line (note the loercase k for kiloBITS), while you then go onto talking about file speeds which are in * kiloBYTES of 7 or 8.
While 7KB/ps or 8KB/ps (note the capital K for KiloBYTES) is still very slow for a 512kbps it is in fact really 56kb/ps or 64kb/ps of the 512.
kiloBYTES convert to kiloBITS by multiplying by 8, and the other way by dividing by 8. So your 512kb/ps line can do a max of 64Kb/ps (still much higher than the reported 7 or 8)


Tech Note from above (to anyone who moans about it LOL)
* in mirc file speeds are actually in CPS (characters per second). I beleieve there is some type of difference in what CPS vs BytesPerSecond, however its pretty minimal if it does exist, as mircs upload/download windows uses KB/sec and it seems to translate to the $send/get().cps exactly.

At one time the conversion from bits to bytes (irrelevant as to the prefix) was a standard 10 (the 8 for the actual 'word' plus a 'start' & 'stop' bit for each 'word'). In this case 'word' actually refers to a single character.

8 bits to a byte , never 10, those are data stream syncing bits from analog modems, there not part of the "word" (not a good phrase in my book since WORD genericly means a 16 bit integer value), also those modems could preform in unsynced stream modes, however line quality had to be very good, else retansmits were so high it made the overall speeds slower .

Could well be...I was trying to recall information that had been passed to me in school, some 25 years ago, so I'm not surprised that I may have gotten some of the terminology incorrect. As to the usage of the term "word", personally, I agree with you, but I couldn't think of another term to use, which is why I put it in quotes, and clarified my meaning in the post.

I would like to point out 'word' is 32 bits. Thanks.

And I would like to point out that your wrong. Thanks.

DWord is 32 bits (Double Word), check regedits DWORD for its length to verify.