Hi there,
Firstly, let me just state that I don't have much* of an opinion on the site itself. I use it to make my trades with different cryptocurrency pairs, and that's about it.
I think everyone who uses Poloniex finds it to be laggy at times, there is no doubt about that. I don't find the severity of it to be that bad, but I do only log in just a couple of times per day to make my trades, and log off again. Those of you who are finding it consistently laggy are obviously finding it annoying, to say the least, and need to be bringing it to their attention - though I think a scam thread is a little too far.
Now, whether any DDoS against the site has been orchestrated by the site themselves, is not something any of us here have the answer to. If you think that they are causing the DDoS themselves, the onus is on you to prove this, not the other way round.
You have opened a scam accusation here, and you have provided zero proof of anything. This should have perhaps been taken directly to their main thread, and not this section, as you have shown nothing here.
*as far as the word "much" relating to my opinion of the site, it boils down to this:
As long as I can transfer in BTC or w/e, make my trades, and withdraw my coins, I am happy. Yes, that has had delays recently as well, and can be somewhat concerning, I get that.
I will say that the site has never really felt that secure to me and so I generally don't keep much on there, but then again that applies everywhere - always keep control of your own coins, no matter who it is.
If you want to proceed with this thread further, that's entirely your choice, but you are going to need something to back up your claims.
Cheers