Exit searchCursor loop after first result

Question

I am attempting to join 2 tables together, and the tools in arcmap, such as add field can't do what I want so I tried using python and arcpy. My approach is to use 2 nested loops and find the values in the 2nd table and update the first one. This is the code that I am using:

with arcpy.da.UpdateCursor(table1, ufield) as ucursor:
for urow in ucursor:
    print(urow[0])
    with arcpy.da.SearchCursor(table2, sfield, """"VALUE" = """ + str(urow[0])) as scursor:
        for srow in scursor:
            print(srow)
            urow[1] = srow[1]
            urow[2] = srow[2]
            urow[3] = srow[3]
            urow[4] = srow[4]
            urow[5] = srow[5]
            urow[6] = srow[6]
            urow[7] = srow[7]
            urow[8] = srow[8]
            urow[9] = srow[9]
            urow[10] = srow[10]
            urow[11] = srow[11]
            urow[12] = srow[12]
            urow[13] = srow[13]
            urow[14] = srow[14]
            urow[15] = srow[15]
            urow[16] = srow[16]
            urow[17] = srow[17]
            urow[18] = srow[18]
            urow[19] = srow[19]
            urow[20] = srow[20]
            ucursor.updateRow(urow)
            n+=1
    print(urow)

The problem is that it is extremely slow, so I would like to speed it up by stopping the search cursor loop after it finds the result. The values are all unique so after it returns a result, there is no need for the loop to keep on going. That was my thought on speeding it up, but of course I am open to other suggestions, or approaches that could help me achieve my goal.

Answer 1

Based on @PolyGeo's answer I used dictionaries which improved the time significantly. I first ran a loop that took all values in the first table and put them in a dictionary and then updated the second table using the dictionary.

value_dict = dict()
    with arcpy.da.SearchCursor(table2, sfield) as scursor:
        for srow in scursor:
            a_id = srow[0]
            b_value = srow[1]
            value_dict[a_id] = b_value
    print("Dictionary created")
    with arcpy.da.UpdateCursor(table1, field2) as ucursor:
        for urow in ucursor:
            urow[1] = value_dict[urow[0]]
            ucursor.updateRow(urow)
            print(urow)
    print("column " + field + " was added to the table")