MySQL fulltext selection performance
I just answered this recent question : Full text search results in a large amount of time spent in &#39;FULLTEXT initialization&#39;

Since you are using MyISAM, I would recommend refactoring your query

Here is my proposed query

SELECT id, 
title, 
company, 
state, 
city 
FROM `jobs` 
WHERE MATCH (title, company, state, city) AGAINST
('senior software engineer in san fransisco california')  
LIMIT 0,10


SELECT B.id, 
B.title, 
B.company, 
B.state, 
B.city 
FROM
(SELECT id FROM`jobs` 
WHERE MATCH (title, company, state, city) AGAINST
('senior software engineer in san fransisco california')  
LIMIT 0,10) A
LEFT JOIN `jobs` USING (id);


GIVE IT A TRY !!!