Excel become really slow because of a lot of xlookup - excel

Hi any remedy to make my excel faster?
This is some sample of my excel formulas
Please help me this is the first time I experience this issue don't know what to do.
Thank you

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Gant table in excel

Experts, can you help me with one task I have? I have to make a Gant table in excel for real production. Do you have any teplate of working gant in excel? I would be grateful if someone could share an example. Thank you in advance.
Isue for excel Gant table

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I have created a GAMS model that takes parameters from Excel and gives back the results to another Excel file. Now, i want to run my GAMS model from the Excel VBA so that it will become more user-friendly. Is it possible to do.
Any help would be greatly appreciated.
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How to make executabile GUI for macros code to run on multiple Excel files?

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I have not tried anything but research. I understand that this may be beyond VBA for Excel's functionality but if so can somebody guide me in the right direction? Thank you for any help!

Referencing other excel sheets in formula

So not able to use vba just yet but need the syntax to reference another sheet when using excel formulas I have tried:
=if((=‘test1’!A3)> 0, ‘test1’A1, B6*F6))
Or something along those lines just a example
Any help would be appreciated, I’m sure it’s something simple I’m messing up. It’s excel 2007 btw.
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Handling complex numbers in Excel spreadsheet

I doubt an Excel spreadsheet can handle this but it's worth asking, since I have been trying and searching for a long time with no success.
Entering this into a cell:
=complex(abs(-1.5*(-1.5)^(-1.5))),0)
and the cell output is #NUM!
The output should be: 0.8164966
I played with this a bit and didn't get anywhere - this article may explain why.
Link
it's complicated, and I think it's more than an excel problem
The following pdf has a nice write-up for using complex number functions in excel.
https://ccnet.stanford.edu/cgi-bin/course.cgi?cc=ee246&action=handout_download&handout_id=ID11300955936304
Seems like you have made a mistake inserting the parentheses.
The correct form is:
=COMPLEX(ABS((-1.5)*((1.5)^(-1.5))),0)
=0.816496580927726
This runs well in Excel 2013.

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