Remove set_time_limit() call. CodeIgniter should respect php.ini setting.
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php
index 00db6e1..e1892ee 100755
--- a/system/core/CodeIgniter.php
+++ b/system/core/CodeIgniter.php
@@ -101,17 +101,6 @@
/*
* ------------------------------------------------------
- * Set a liberal script execution time limit
- * ------------------------------------------------------
- */
- if (function_exists('set_time_limit') && @ini_get('safe_mode') == 0
- && php_sapi_name() !== 'cli') // Do not override the Time Limit value if running from Command Line
- {
- @set_time_limit(300);
- }
-
-/*
- * ------------------------------------------------------
* Start the timer... tick tock tick tock...
* ------------------------------------------------------
*/