How to diagnose .htaccess speed issues via RewriteLog

We have .htaccess setup to handle URLs like:

http://www.oursite.com/events/Health/Insectology/343/346.html

But clicking from such a generated page to:

http://www.oursite.com/events/Anything/Anything/abc/abc.html

Seems to reload the page completely (and not use the cached images).

(This question is related to http://stackoverflow.com/questions/3971910/url-rewritten-pages-force-browser-to-reload-page )

By turning on RewriteLog, I'm seeing tons of lines, but not sure how to make sense of them... what do I do with them?

Edit 1

The below is the log at RewriteLogLevel 2 when I:

Accessed the homepage at: www.example.com/abcd/
Clicked on the link to browse categories

Clicked on the category - Language

URL/sid#ID = www.example.com/sid#2b06c5712d30

Step 1
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir ar/www/html/abcd/] pass through /var/www/html/abcd/index.php
Step 2
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (2) [perdir /var/www/html/abcd/] rewrite 'classes-events.html' -> 'browse.php?type=classes-events'
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (2) [perdir /var/www/html/abcd/] trying to replace prefix /var/www/html/abcd/ with /abcd/
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir /var/www/html/abcd/] internal redirect with /abcd/browse.php [INTERNAL REDIRECT]
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56d8528/initial/redir#1] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/browse.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/showUserData.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/showUserData.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/showUserData.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/browse.php
Step 3
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (2) [perdir /var/www/html/abcd/] rewrite 'classes-events/Language/206.html' -> 'browse.php?type=classes-events&catId=206'
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (2) [perdir /var/www/html/abcd/] trying to replace prefix /var/www/html/abcd/ with /abcd/
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56caf10/initial] (1) [perdir /var/www/html/abcd/] internal redirect with /abcd/browse.php [INTERNAL REDIRECT]
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56d8948/initial/redir#1] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/browse.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56ccf20/initial] (2) [perdir /var/www/html/abcd/] rewrite 'classes-events/Language/ajax/showUserData.php' -> 'ajax/showUserData.php'
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56ccf20/initial] (2) [perdir /var/www/html/abcd/] trying to replace prefix /var/www/html/abcd/ with /abcd/
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56ccf20/initial] (1) [perdir /var/www/html/abcd/] internal redirect with /abcd/ajax/showUserData.php [INTERNAL REDIRECT]
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56d59d8/initial/redir#1] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/showUserData.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56ccf20/initial] (2) [perdir /var/www/html/abcd/] rewrite 'classes-events/Language/ajax/showUserData.php' -> 'ajax/showUserData.php'
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56ccf20/initial] (2) [perdir /var/www/html/abcd/] trying to replace prefix /var/www/html/abcd/ with /abcd/
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56ccf20/initial] (1) [perdir /var/www/html/abcd/] internal redirect with /abcd/ajax/showUserData.php [INTERNAL REDIRECT]
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56da9f8/initial/redir#1] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/showUserData.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56cef30/initial] (2) [perdir /var/www/html/abcd/] rewrite 'classes-events/Language/ajax/showUserData.php' -> 'ajax/showUserData.php'
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56cef30/initial] (2) [perdir /var/www/html/abcd/] trying to replace prefix /var/www/html/abcd/ with /abcd/
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56cef30/initial] (1) [perdir /var/www/html/abcd/] internal redirect with /abcd/ajax/showUserData.php [INTERNAL REDIRECT]
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56f4268/initial/redir#1] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/showUserData.php
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56cef30/initial] (2) [perdir /var/www/html/abcd/] rewrite 'classes-events/Language/ajax/browse.php' -> 'ajax/browse.php'
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56cef30/initial] (2) [perdir /var/www/html/abcd/] trying to replace prefix /var/www/html/abcd/ with /abcd/
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d56cef30/initial] (1) [perdir /var/www/html/abcd/] internal redirect with /abcd/ajax/browse.php [INTERNAL REDIRECT]
IPADDRESS - - [DATETIME] [URL/sid#ID][rid#2b06d57127d8/initial/redir#1] (1) [perdir /var/www/html/abcd/] pass through /var/www/html/abcd/ajax/browse.php

Edit 2

The .htaccess rules we're using:

Edit 1 - this is the .htaccess that we're using

RewriteEngine On
RewriteBase /abcd/

RewriteRule ^.*/codelibrary/(.*)$ codelibrary/$1 [L]
#RewriteCond %{THE_REQUEST} in_upload/images/(.*) [NC,OR]
RewriteRule ^.*/in_upload/images/(.*)$ in_upload/images/$1 [L]
RewriteCond %{REQUEST_URI} !in_upload/(.*)\.
RewriteRule ^.*/images/(.*)$ images/$1 [L]
RewriteRule ^.*/admin/ajax/(.*)$ admin/ajax/$1 [L]
RewriteCond %{REQUEST_URI} !admin/(.*)\.
RewriteRule ^.*/ajax/(.*)$ ajax/$1 [L]

RewriteRule ^.*/banner_images/(.*)$ banner_images/$1 [L]

#php_flag magic_quotes_gpc off
RewriteRule (.*)invite/([a-zA-Z0-9]+)$ referer.php?in_name=$2
RewriteRule (.*)cms/([a-zA-Z\-]*).html$ static-pages.php?page_url=$2 [L]
RewriteRule ^([a-zA-Z0-9]+)$ t-profile-public.php?name=$1

RewriteRule (.*)cms/([a-zA-Z\-]*).html$ static-pages.php?page_url=$2 [L]

RewriteRule (.*)classes-events.html$ browse.php?type=classes-events [L]
RewriteRule (.*)ins.html$ browse.php?type=ins [L]
RewriteRule (.*)orgs.html$ browse.php?type=orgs [L]
RewriteRule (.*)random-content.html$ browse.php?type=content&random_order=1 [L]
RewriteRule (.*)content.html$ browse.php?type=content [L]

RewriteRule ^([a-zA-Z\-]*)/([a-zA-Z0-9\s]*)/([0-9]*)\.html$ browse.php?type=$1&catId=$3 [L]
RewriteRule ^([a-zA-Z\-]*)/([a-zA-Z0-9\s]*)/([a-zA-Z0-9\s]*)/([0-9]*)/([0-9]*)\.html$ browse.php?type=$1&catId=$4&subCatId=$5 [L]
#RewriteRule (.*)search/all/([a-zA-Z0-9\s]*)$ searchall.php?type=all&srcval=$2 [L]
#RewriteRule (.*)search/([a-zA-Z\s\-]*)/([a-zA-Z0-9\s]*)$ search.php?type=$2&srcval=$3 [L]
#RewriteRule (.*)search/([a-zA-Z\s\-]*)/all/([a-zA-Z0-9\s]*)$ search.php?type=$2&srcval=$3&seeall=all [L]
#RewriteRule (.*)featured/([a-zA-Z\s\-]*)$ featured-listing.php?type=$2&feature=1 [L]
#RewriteRule (.*)featured/([a-zA-Z\-]*)/([a-zA-Z0-9\s]*)/([0-9]*)\.html$ featured-listing.php?type=$2&catId=$4&feature=1 [L]

RewriteRule (.*)search/all/(.*)$ searchall.php?type=all&srcval=$2 [L]
RewriteRule (.*)search/([a-zA-Z\s\-]*)/all/(.*)$ search.php?type=$2&srcval=$3&seeall=all [L]
RewriteCond %{REQUEST_URI} !all/(.*)\.
RewriteRule (.*)search/([a-zA-Z\s\-]*)/(.*)$ search.php?type=$2&srcval=$3 [L]
RewriteRule (.*)featured/(.*)$ featured-listing.php?type=$2&feature=1 [L]
RewriteRule (.*)featured/([a-zA-Z\-]*)/(.*)/([0-9]*)\.html$ featured-listing.php?type=$2&catId=$4&feature=1 [L]
ErrorDocument 404 http://www.oursite.com/abcd/404.php

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How to diagnose .htaccess speed issues via RewriteLog

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