Allowed memory exhausted after 8 levels

[ocean90]

If you use 8 levels you get problems with your memory limit, in this case with 32MB (and 64MB), screen of the menu items: ​http://grab.by/42jU

Allowed memory size of 33554432 bytes exhausted (tried to allocate 12321150 bytes) in <b>H:\xampplite\htdocs\wp\wp-includes\nav-menu-template.php</b> on line <b>158</b><br />
Allowed memory size of 67108864 bytes exhausted (tried to allocate 38538081 bytes) in <b>/var/www/web39/html/blog/wp-includes/nav-menu-template.php</b> on line <b>142</b>

[ocean90]

Menu items as SQL: ​http://paste2.org/p/798796

[ocean90]

Now only 7 levels, memory limit 128MB.

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 95949765 bytes) in H:\xampplite\htdocs\wp\wp-includes\nav-menu-template.php  on line 42

That is a blocker for me.

The SQL queries are also very high, saving only one item 77 queries, saving 2 items 116 queries, 2 items with one level 199 queries.

Another one: add three times the same post and add one of them as a first level. After clicking Save Menu:

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 98009700 bytes) in H:\xampplite\htdocs\wp\wp-includes\nav-menu-template.php  on line 42

[ocean90]

Fixed with [14557], [14558], [14559], [14560], [14562], [14567], [14568], [14569].
See #12734.