Seems the author does not care or has abandoned the project, here are the required fixes:
WP-Optimize Version 0.9.2
File wp-optimize.php, Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead.
Old line 52:
if (function_exists('add_meta_box')) {
add_menu_page("WP-Optimize", "WP-Optimize", 2, "WP-Optimize", "optimize_menu");
} else {
add_submenu_page("index.php", "WP-Optimize", "WP-Optimize", 2, "WP-Optimize", "optimize_menu");
} // end if addmetabox
New line 52:
if (function_exists('add_meta_box')) {
add_menu_page("WP-Optimize", "WP-Optimize", "manage_options", "WP-Optimize", "optimize_menu");
} else {
add_submenu_page("index.php", "WP-Optimize", "WP-Optimize", "manage_options", "WP-Optimize", "optimize_menu");
} // end if addmetabox
File wp-optimize-admin.php, fixes for some more warnings:
Old line 62: $clean = "";
New line 62: $clean = ""; $message = "";
Old line 144: $sql = "";
New line 144: $sql = ""; $message = "";
Old line 375: $tot_data = 0;
New line 375: $tot_data = 0; $total_gain = 0;
http://wordpress.org/extend/plugins/wp-optimize/