Just taken a quick look at the original query as requested by Gaz.
Does the below reflect the data setup? Would appear odd to have a lookup for rates amidst the list of data?
With the existing concatenated match array formula it will be somewhat sluggish and formulas / applied ranges must be kept to a minimum.
I have my Excel on a Mac using Parallels so it may not be the fastest.
4500 rows of data similar to below calcs in a slow blink with 2007 but takes 17 seconds with 2013 !!!!!!
<colgroup><col style="width: 25pxpx"><col><col><col><col><col><col><col></colgroup><thead>
</thead><tbody>
[TD="align: center"]1[/TD]
[TD="align: center"]Employee[/TD]
[TD="align: center"]Client[/TD]
[TD="align: center"]Days Work[/TD]
[TD="bgcolor: #DBE5F1, align: center"]Employee[/TD]
[TD="bgcolor: #DBE5F1, align: center"]Client[/TD]
[TD="bgcolor: #DBE5F1, align: center"]Rate[/TD]
[TD="align: center"][/TD]
[TD="align: center"]2[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]A[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]1[/TD]
[TD="bgcolor: #DBE5F1, align: center"]A[/TD]
[TD="bgcolor: #DBE5F1, align: center"]99.54[/TD]
[TD="align: center"]995.4[/TD]
[TD="align: center"]3[/TD]
[TD="align: center"]2[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]1[/TD]
[TD="bgcolor: #DBE5F1, align: center"]B[/TD]
[TD="bgcolor: #DBE5F1, align: center"]6[/TD]
[TD="align: center"]23450[/TD]
[TD="align: center"]4[/TD]
[TD="align: center"]2[/TD]
[TD="align: center"]A[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]1[/TD]
[TD="bgcolor: #DBE5F1, align: center"]C[/TD]
[TD="bgcolor: #DBE5F1, align: center"]7[/TD]
[TD="align: center"]80[/TD]
[TD="align: center"]5[/TD]
[TD="align: center"]2[/TD]
[TD="align: center"]C[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]2[/TD]
[TD="bgcolor: #DBE5F1, align: center"]A[/TD]
[TD="bgcolor: #DBE5F1, align: center"]8[/TD]
[TD="align: center"]100[/TD]
[TD="align: center"]6[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]2[/TD]
[TD="bgcolor: #DBE5F1, align: center"]B[/TD]
[TD="bgcolor: #DBE5F1, align: center"]2345[/TD]
[TD="align: center"]60[/TD]
[TD="align: center"]7[/TD]
[TD="align: center"]2[/TD]
[TD="align: center"]D[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]2[/TD]
[TD="bgcolor: #DBE5F1, align: center"]C[/TD]
[TD="bgcolor: #DBE5F1, align: center"]10[/TD]
[TD="align: center"]560[/TD]
[TD="align: center"]8[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]E[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]3[/TD]
[TD="bgcolor: #DBE5F1, align: center"]A[/TD]
[TD="bgcolor: #DBE5F1, align: center"]11[/TD]
[TD="align: center"]120[/TD]
[TD="align: center"]9[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]F[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]3[/TD]
[TD="bgcolor: #DBE5F1, align: center"]B[/TD]
[TD="bgcolor: #DBE5F1, align: center"]12[/TD]
[TD="align: center"]550[/TD]
[TD="align: center"]10[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]A[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]3[/TD]
[TD="bgcolor: #DBE5F1, align: center"]C[/TD]
[TD="bgcolor: #DBE5F1, align: center"]13[/TD]
[TD="align: center"]995.4[/TD]
[TD="align: center"]11[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]1[/TD]
[TD="bgcolor: #DBE5F1, align: center"]F[/TD]
[TD="bgcolor: #DBE5F1, align: center"]55[/TD]
[TD="align: center"]60[/TD]
[TD="align: center"]12[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]A[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]1[/TD]
[TD="bgcolor: #DBE5F1, align: center"]D[/TD]
[TD="bgcolor: #DBE5F1, align: center"]9[/TD]
[TD="align: center"]995.4[/TD]
[TD="align: center"]13[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]10[/TD]
[TD="bgcolor: #DBE5F1, align: center"]1[/TD]
[TD="bgcolor: #DBE5F1, align: center"]E[/TD]
[TD="bgcolor: #DBE5F1, align: center"]12[/TD]
[TD="align: center"]60[/TD]
[TD="align: center"]14[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]A[/TD]
[TD="align: center"]10[/TD]
[TD="align: center"]2[/TD]
[TD="align: center"]D[/TD]
[TD="align: center"]56[/TD]
[TD="align: center"]995.4[/TD]
[TD="align: center"]15[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]C[/TD]
[TD="align: center"]10[/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"]70[/TD]
[TD="align: center"]16[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]B[/TD]
[TD="align: center"]10[/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"]60[/TD]
[TD="align: center"]17[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]D[/TD]
[TD="align: center"]10[/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"]90[/TD]
[TD="align: center"]18[/TD]
[TD="align: center"]1[/TD]
[TD="align: center"]E[/TD]
[TD="align: center"]10[/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"]120[/TD]
</tbody>
If entered correctly, Excel will surround with curly braces {}.
Will be out until late afternoon but will be happy to pick up on this when I return.