I can't think of a single capitalized keyword.
Unless you mean capitalized built-in classes, or the infix meta operators.
Certain parts are faster than Perl 5, for example this finds the sum of a range in less than a millisecond. ( of course it cheats by calling the sum method on the Range object )
my $sum = [+] 1..100000000000000000000000;
That was the syntax for a left fold using the infix numeric addition operator. ( You can use just about any infix operator there and it will be a right fold if the operator says that is what it should do )
There are other places where if you write your code carefully knowing the ins and outs of the implementation, where Perl 6 is faster than you could get in Perl 5.
Then there is the fact that a lot of optimizations that are known about aren't being done, and a new JIT is in the works for MoarVM.