Need some help to speed up varnish

[Jewel Nuruddin]

Hello All
Here I attached my default.vcl file and /etc/sysconfig/varnish file
I check with varnish and without varnish but found without varnish is
faster then with varnish.
Can any one please help me whats wrong with my configuration.
I am new in varnish.
My basic criteria I want to cache every thing except logged users.(This is
working as my configuration)
So I need to up varnish speed.
Thanks
Jewel
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DAEMON_OPTS="-a :80 \
             -T localhost:6082 \
             -f /etc/varnish/default.vcl \
             -u varnish -g varnish \
             -S /etc/varnish/secret \
             -p thread_pool_add_delay=2 \
             -p thread_pools=2 \
             -p thread_pool_max=10000 \
             -p session_linger=100 \
             -p sess_workspace=262144 \
             -s malloc,4G"
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