Originariamente inviato da Fabio Heller
... e non è certo il massimo a livello di prestazioni
codice:
Comparing ADODB with PEAR DB, MDB, dbx, Metabase and Native MySQL
Benchmark was to select 82 rows from the products table 200 times.
The tests were repeated 5 times. Connection times were excluded
from the benchmark. Lower values are better. All numbers are in 
seconds. 

MySQL	 1.12 	1.12	1.17	1.15	1.14
ADOdbext 1.30	1.31	1.29	1.30	1.32 
dbx ext	 1.35	1.38	1.41	1.37	1.36	(index only)
ADOdb	 1.43	1.47	1.47	1.44	1.45
dbx ext	 1.53	1.52	1.52	1.52	1.55	(index/assoc/info)
PhpLib	 1.53	1.62	1.64	1.64	1.57   
MDB      1.77	1.75	1.75	1.76	1.73
PEAR DB	 2.91	2.90	2.85	2.83	2.84	(fetchInto)
PEAR DB	 3.14 	3.13	3.22	3.12	3.16	(fetchRow)
M'base	 4.51	4.55 	4.46 	4.54 	4.52    (numeric indexes)
M'base	 4.99	4.72	4.71	4.71	4.72	(assoc indexes)

        Average	 Overhead
MySQL	 1.14	   -
ADOdbext 1.30     14%
dbx      1.37     20% (index only)
ADOdb	 1.45	  27%
dbx      1.53     34% (index/assoc/info)
PhpLib	 1.60	  40%
MDB      1.75	  54%
PEAR DB  2.87	 152% (fetchInto)
PEAR DB  3.15	 176% (fetchRow)
M'base	 2.52	 296% (numeric cols)
M'base	 4.77	 318% (assoc cols)


I was still surprised at how slow some of the libraries were, even
though a code inspection had already given strong hints on the expected
performance of the libraries.

(da: http://phplens.com/lens/adodb/)