|> What is Pliant especially good at?
Let's assume that you want to devellop everything (the kernel, the database
engine, the compiler, the applications, the macros, etc) with a single language
in order to reduce glue, reduce young people training time, not be constrained
to use the common set (minimal) of features among various languages, etc.
Which one do you select ?
I could even ask the question the other way round:
Do you know any single other candidate ?
So my direct answer to your question is:
There is nothing it's too bad at.
If you prefer a positive answer, it could be:
Combining C like raw execution speed and LISP like internal code generator
for increasing expression power.
> Aside from that how is the performance of the various Pliant applications,
> for example the http server?
The best is to make you own tests.
Most CPU power consumed by the HTTP server is related to side effects:
crypto for secured connection, compression in order to save bandwidth,
signing some datas passed to the browser in order to prevent browser content
forging, server side rendering.