<select name="speed" id="speed" style="display: none;">
     <option>Slower</option>
     <option>Slow</option>
     <option selected="selected">Medium</option>
     <option>Fast</option>
     <option>Faster</option>
</select>

@{mylist}=    Get Webelements    //*[@id='speed']/option
${i}=    Set Variable    0
${len}=    Get Length    ${mylist}
:FOR    ${elem}    IN    @{mylist}
    Log To Console    ${elem}
    ${value}=    Get Text    ${elem}
    Log To Console    ${value}
    ${ival}=    Convert To String    ${i}
    Run Keyword if    '${value}'=='Faster' or ${value}'=='Navigation Commands'
    ...    Select From List By Index    speed    ${ival}
    ${i}=    Evaluate    ${i}+1
    Log To Console    ${i}
END