Bug Reinstallation failed

Hello, first of all i have a website and i installed 2.0 version and i had fix the internal 500 error bug.
I have upgraded kunena to 2.0.1 but i experience bugs like very slow loading, category manager buggy...

If i decide to reinstall kunena even in 2.0.1 i can see the installation progressing until 100%, but impossible to find the component into joomla ! In component tab kunena doesn't exist but in extension manager i can see kunena exists.

I experience too much slow responds in kunena, please here is my kunna config:

Database collation check: The collation of your table fields are correct

Legacy mode: Disabled | Joomla! SEF: Enabled | Joomla! SEF rewrite: Disabled | FTP layer: Disabled |

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 192M | Max file upload: 192M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path
110	forum	kunenamenu	view=home&defaultmenu=112	forum
111	Index	kunenamenu	view=category&layout=list	forum/index
112	Sujets récents	kunenamenu	view=topics&mode=replies	forum/messagesrecents
113	Nouveau sujet	kunenamenu	view=topic&layout=create	forum/nouveausujet
114	Pas de réponse	kunenamenu	view=topics&mode=noreplies	forum/sansreponse
115	Mes sujets	kunenamenu	view=topics&layout=user&mode=default	forum/mesrecents
116	Profil	kunenamenu	view=user	forum/profil
117	Aide	kunenamenu	view=misc	forum/aide
118	Recherche	kunenamenu	view=search	forum/recherche
119	Forum	mainmenu	Itemid=110	kunena-2012-07-05

Joomla default template details : yoo_catalyst | author: YOOtheme | version: 1.0.6 | creationdate: July 2012

Kunena default template details : SD-Aphotic | GixX Forum | author: SnilloC Designs | version: 2.1 | creationdate: 2012-07-08

Kunena version detailed: Kunena 2.0.1 | 2012-07-07 [ Balozi ]
| Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	6
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	sd_aphotic
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	1
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	0
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
changename	0
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2048
imageheight	800
imagewidth	800
imagesize	150
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2
filesize	120
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_name	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_usertype	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
usernamechange	0
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	0
defaultpage	recent
default_sort	asc
sef	0
sefutf8	0
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	mesid
post_dateformat	ago
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	2
latestcategory_in	1
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
version_check	1
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	1
lightbox	1
show_list_time	720
show_session_type	0
show_session_starttime	0
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	1
category_subscriptions	post
topic_subscriptions	every
pubprofile	1
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
keywords	0
userkeywords	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	1
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	8
pickup_category	0
article_display	intro
send_emails	1
fallback_english	1
cache	0
cache_time	60

| Kunena integration settings:

Warning: Spoiler!

Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Enabled: access=1 login=1 activity=1 avatar=1 profile=1 private=1
Kunena - Gravatar Disabled
Kunena - JomSocial Disabled
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Enabled: private=1

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (United Kingdom)
fr-FR	Français (FR)

Third-party components: CommunityBuilder 1.8.1 | UddeIM 2.8

Third-party SEF components: None

Plugins: None

Modules: None

I cannot find any issues in the frontend at least -- Kunena seems to be pretty fast and running well.

Yes, category manager seems to be buggy on reordering, I just found it out less than a hour ago when one of our team members was moving categories. Will fix that soon...

Cannot you find Kunena from the backend? I've seen that before but I thought that Joomla team had fixed that bug by now.

It's just in the case of reinstalling kunena. Look at my second website: www.xion-games.net , go to forum, there is a radical difference between the two forums. Xion is faster. When my first website was just installed, it was already slow. I could get it a little faster by disabling SEF.

I agree. I've run some tests and Joomla SEF seems to take ~30% of the rendering time spent in Kunena -- and almost as much even if it is turned off. I'm currently looking ways to make it faster, but for that I need either to fix it into Joomla (if possible) or bypass the standard routing.

I suppose you will implement that into a future update ?