Genesis/AmiTPC slower than MiamiDX. What am i doing wrong?

[Framiga]

my AmiTCP.config is:

PRIORITY = 5

MBUF_CONF Initial =     2
MBUF_CONF Chunk =       64
MBUF_CONF ClChunk =     4
MBUF_CONF MaxMem =      2048
MBUF_CONF ClusterSize = 2048

;LOG Count =     4
;LOG Len =     128
;LOG Filter =    7
LOG FilterCons = 7
LOG FilterFile = 7

DebugSana = no
DebugIP =   no
Gateway =   no
IPSendRedirects = no
;UseNameServer = SECOND
;UseLoopBack = YES

TCP_SendSpace = 32768
TCP_RecvSpace = 32768