Deleting millions of rows

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I'm using 8.3.5. Table ts_defects has 48M rows. Through psql: delete from ts_defects;
Result: out of memory/Can't allocate size: 32
I then did 10 or so deletes to get rid of the rows. Afterwards, inserts into or queries on this table performed significantly slower. I tried a vacuum analyze, but this didn't help. To fix this,
I dumped and restored the database.

1) why can't postgres delete all rows in a table if it has millions of rows?
2) is there any other way to restore performance other than restoring the database?

Thanks,
Brian


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