python - Importing ArcPy taking many seconds and code is really slow for GeoProcessing Tools 64-bit (ArcGIS 10.1 SP1)

I've installed ArcGIS10.1 SP1 and whenever I import arcpy (on Pywin console or Eclipse PyDev) it takes aprox. 15-20seconds. Is this normal? I don't think so...

I had Python 2.7.3 64-bit previously installed on my Windows 7 (and still use it) and now I also have Python 32-bit and Python 64-bit that came with ArcGIS. I think I might have the paths confused, because the 64bit version of Python 2.7 in the folder C:\Python27\ArcGISx6410.1was supposed to be 2.7.2, but when I check the version, inside that path, it gives me:

C:\Python27\ArcGISx6410.1>python.exe Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win 32

My %PATH% has this, among other paths:

...

C:\Python27
C:\Python27\Scripts
C:\Program Files (x86)\ArcGIS\Desktop10.1\Bin
C:\Program Files (x86)\ArcGIS\EsriProductionMapping\Desktop10.1\Bin
...

And I didn't need to set PYTHONPATH. My ArcMap Python shell works fine and so does the 64-bit version for the backgorund scripting.

My code is very simple: basically I have to find how many times does a node (NO) from a node feature class appears in other line feature class. It works, but for #6290 nodes, it takes more than 10min!

'''


# Import system modules
import arcpy, sys
from arcpy import env

print "Running against: {}".format(sys.version)

def do_search_by_cursor(table,searchString):
    count = 0
    count += cursor_search_count(table,searchString)    
    #print "done by cursor: " + str(count)

    return count

def cursor_search_count(table,searchstring):
    rows = arcpy.SearchCursor(table,searchstring)
    count = 0
    for row in rows:
        count += 1
    return count

# Set the workspace environment to local file geodatabase

env.workspace = "S:/workspace/MSc_git/ArcGis/estagio_db.gdb"

# Set local variables
fc_nodes = "Rede_Cbr_MM_node_proj"
fc_links = "Rede_Cbr_MM_2008_WithoutMetro"
# fieldName1 = "LEGS"
# fieldAlias = "numLegs"

fieldname="TONODENO"
# Create field name with the proper delimiters

delimitedfield = arcpy.AddFieldDelimiters(fc_links, fieldname)

# Create search cursor:
rows = arcpy.SearchCursor(fc_nodes, "", "", fields="NO")

for row in rows:
    searchStr= delimitedfield +" = " +str(row.NO)
    myvar= do_search_by_cursor(fc_links, searchStr)
    print "Node %d has %d legs" %(row.NO,myvar)

My PyDev is configured to use the specific Python Interpreter that came with ArcGIS processing Tools 64-bit and looks like this (I've checked all...):

If you could give a hint or a link (I've already explored, but nothing seems to work), I'll appreciate it.