Agreed, I did quite well until around 1500. At 1400, I did decode Þ after a while. I realized I was mostly reading though the sounds on my head as opposed to recognizing the word shapes anymore, which was quite interesting.

1300 started to get hard because I was missing the meaning of some words completely. 1200 was where I gave up.

Now, English is my 2nd language so I was surprised I could go that far.