سلام بر همگی.
برای بهینه کردن این فایل فقط کافیه کد های زیر را به انتهای ان اضافه کنید:

کد:
# Author: wikivb 
# Version 2.8
RewriteEngine on


<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?routestring=$1 [L,QSA]
RewriteRule ^(admincp/)$ index.php?routestring=$1 [L,QSA]
</IfModule>
<Files .htaccess>
Order allow,deny
Deny from all
</Files>
<IfModule mod_mime.c>
        AddType text/css .css
        AddType text/richtext .rtf .rtx
        AddType image/svg+xml .svg .svgz
        AddType text/plain .txt
        AddType text/xsd .xsd
        AddType text/xsl .xsl
        AddType video/asf .asf .asx .wax .wmv .wmx
        AddType video/avi .avi
        AddType image/bmp .bmp
        AddType application/java .class
        AddType video/divx .divx
        AddType application/msword .doc .docx
        AddType application/x-msdownload .exe
        AddType image/gif .gif
        AddType application/x-gzip .gz .gzip
        AddType image/x-icon .ico
        AddType image/jpeg .jpg .jpeg .jpe
        AddType application/vnd.ms-access .mdb
        AddType audio/midi .mid .midi
        AddType video/quicktime .mov .qt
        AddType audio/mpeg .mp3 .m4a
        AddType video/mp4 .mp4 .m4v
        AddType video/mpeg .mpeg .mpg .mpe
        AddType application/vnd.ms-project .mpp
        AddType application/vnd.oasis.opendocument.database .odb
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        AddType application/vnd.oasis.opendocument.graphics .odg
        AddType application/vnd.oasis.opendocument.presentation .odp
        AddType application/vnd.oasis.opendocument.spreadsheet .ods
        AddType application/vnd.oasis.opendocument.text .odt
        AddType audio/ogg .ogg
        AddType application/pdf .pdf
        AddType image/png .png
        AddType application/vnd.ms-powerpoint .pot .pps .ppt .pptx
        AddType audio/x-realaudio .ra .ram
        AddType application/x-shockwave-flash .swf
        AddType application/x-tar .tar
        AddType image/tiff .tif .tiff
        AddType audio/wav .wav
        AddType audio/wma .wma
        AddType application/vnd.ms-write .wri
        AddType application/vnd.ms-excel .xla .xls .xlsx .xlt .xlw
        AddType application/zip .zip
</IfModule>
<IfModule mod_expires.c>
        ExpiresActive On
        ExpiresByType text/css A2628000
        ExpiresByType text/richtext A3600
        ExpiresByType image/svg+xml A3600
        ExpiresByType text/plain A3600
        ExpiresByType text/xsd A3600
        ExpiresByType text/xsl A3600
        ExpiresByType video/asf A2628000
        ExpiresByType video/avi A2628000
        ExpiresByType image/bmp A2628000
        ExpiresByType application/java A2628000
        ExpiresByType video/divx A2628000
        ExpiresByType application/msword A2628000
        ExpiresByType application/x-msdownload A2628000
        ExpiresByType image/gif A2628000
        ExpiresByType application/x-gzip A2628000
        ExpiresByType image/x-icon A2628000
        ExpiresByType image/jpeg A2628000
        ExpiresByType application/vnd.ms-access A2628000
        ExpiresByType audio/midi A2628000
        ExpiresByType video/quicktime A2628000
        ExpiresByType audio/mpeg A2628000
        ExpiresByType video/mp4 A2628000
        ExpiresByType video/mpeg A2628000
        ExpiresByType application/vnd.ms-project A2628000
        ExpiresByType application/vnd.oasis.opendocument.database A2628000
        ExpiresByType application/vnd.oasis.opendocument.chart A2628000
        ExpiresByType application/vnd.oasis.opendocument.formula A2628000
        ExpiresByType application/vnd.oasis.opendocument.graphics A2628000
        ExpiresByType application/vnd.oasis.opendocument.presentation A2628000
        ExpiresByType application/vnd.oasis.opendocument.spreadsheet A2628000
        ExpiresByType application/vnd.oasis.opendocument.text A2628000
        ExpiresByType audio/ogg A2628000
        ExpiresByType application/pdf A2628000
        ExpiresByType image/png A2628000
        ExpiresByType application/vnd.ms-powerpoint A2628000
        ExpiresByType audio/x-realaudio A2628000
        ExpiresByType application/x-shockwave-flash A2628000
        ExpiresByType application/x-tar A2628000
        ExpiresByType image/tiff A2628000
        ExpiresByType audio/wav A2628000
        ExpiresByType audio/wma A2628000
        ExpiresByType application/vnd.ms-write A2628000
        ExpiresByType application/vnd.ms-excel A2628000
        ExpiresByType application/zip A2628000
</IfModule>
<IfModule mod_deflate.c>
        <IfModule mod_setenvif.c>
                BrowserMatch ^Mozilla/4 gzip-only-text/html
                BrowserMatch ^Mozilla/4\.0[678] no-gzip
                BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
                BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
        </IfModule>
        <IfModule mod_headers.c>
                Header append Vary User-Agent env=!dont-vary
        </IfModule>
        <IfModule mod_filter.c>
                AddOutputFilterByType DEFLATE text/css application/x-javascript text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon
        </IfModule>
</IfModule>
<FilesMatch "\.(css|CSS|)$">
        <IfModule mod_headers.c>
                Header set Pragma "public"
                Header append Cache-Control "public, must-revalidate, *****-revalidate"
        </IfModule>
        FileETag MTime Size
        <IfModule mod_headers.c>
                 Header set X-Powered-By "Step by Step guide to speed up your VB5"
        </IfModule>
</FilesMatch>
<FilesMatch "\.(rtf|rtx|svg|svgz|txt|xsd|xsl|RTF|RTX|SVG|SVGZ|TXT|XSD|XSL|)$">
        <IfModule mod_headers.c>
                Header set Pragma "public"
                Header append Cache-Control "public, must-revalidate, *****-revalidate"
        </IfModule>
        FileETag MTime Size
        <IfModule mod_headers.c>
                 Header set X-Powered-By "Step by Step guide to speed up your VB5"
        </IfModule>
</FilesMatch>
<FilesMatch "\.(asf|asx|wax|wmv|wmx|avi|bmp|class|divx|doc|docx|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|mpp|odb|odc|odf|odg|odp|ods|odt|ogg|pdf|png|pot|pps|ppt|pptx|ra|ram|swf|tar|tif|tiff|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip|ASF|ASX|WAX|WMV|WMX|AVI|BMP|CLASS|DIVX|DOC|DOCX|EXE|GIF|GZ|GZIP|ICO|JPG|JPEG|JPE|MDB|MID|MIDI|MOV|QT|MP3|M4A|MP4|M4V|MPEG|MPG|MPE|MPP|ODB|ODC|ODF|ODG|ODP|ODS|ODT|OGG|PDF|PNG|POT|PPS|PPT|PPTX|RA|RAM|SWF|TAR|TIF|TIFF|WAV|WMA|WRI|XLA|XLS|XLSX|XLT|XLW|ZIP)$">
        <IfModule mod_headers.c>
                Header set Pragma "public"
                Header append Cache-Control "public, must-revalidate, *****-revalidate"
        </IfModule>
        FileETag MTime Size
        <IfModule mod_headers.c>
                 Header set X-Powered-By "Step by Step guide to speed up your VB5"
        </IfModule>
</FilesMatch>
موفق و سربلند باشید.