very long time taken to compile pdf from tex studio

Question

I am using Tex Studio on Windows 10. Here is the simple code which I am executing

\documentclass{article}
%\usepackage{siunitx}
%\sisetup{
%round-mode = places,
%round-precision = 2, 
%}

\begin{document}
\begin{table}[h!]
\begin{center}

\begin{tabularx}{| X | X | X |}
\hline
\textbf{Value 1} & \textbf{Value 2} & \textbf{Value 3}\\
$\alpha$ & $\beta$ & $\gamma$ \\
\hline
1 & 1110.1 & a \\
2 & 10.1  & b \\
3 & 23.113231 & c \\
\hline
\end{tabularx}
\end{center}
\caption{Your first label}
\label{tab:table1}
\end{table}

\begin{table} [h!]
\begin{center}
\begin{tabular}{|r | l |}
    \hline
    7C0 & hexadecimal \\
    3700 & octal \\
    \cline{2-2}} 11111000000 & binary \\
    \hline
\end{tabular}
\end{center}
\caption{Your second label}
\label{tab:table2}
\end{table}


\begin{tabular}{cc}
    boring cell content & \parbox[t]{5cm}{rather long par\\new par}
\end{tabular}

\end{document}

I clicked the arrow

the arrow which is double generates the preview.I have previously written paper in latex and used Tex studio. The same laptop and same setup. So I know it does not take this long time for simple code to compile and generate a preview pdf. What I am doing is very simple I am not clear with usage of tabular in latex so I am trying to practise with it by example codes given https://en.wikibooks.org/wiki/LaTeX/Tables#The_tabularx_package and https://www.latex-tutorial.com/tutorials/tables/ so my programs are very simple sinppets of code which I am trying to practise. The code posted in above should not at all take a very very long time to compile. So what is the problem I am not able to understand. Here is a preview of settings if this helps

as suggested in comments I looked at the error messages here are the error messages

Environment tabularx undefined. \begin{tabularx}
Misplaced \noalign. \hline
Misplaced alignment tab character &. \textbf{Value 1} &
Misplaced alignment tab character &. \textbf{Value 1} & \textbf{Value 2} &
Misplaced alignment tab character &. $\alpha$ &
Misplaced alignment tab character &. $\alpha$ & $\beta$ &
Misplaced \noalign. \hline
Misplaced alignment tab character &. 1 &
Misplaced alignment tab character &. 1 & 1110.1 &
Misplaced alignment tab character &. 2 &
Misplaced alignment tab character &. 2 & 10.1 &
Misplaced alignment tab character &. 3 &
Misplaced alignment tab character &. 3 & 23.113231 &
Misplaced \noalign. \hline
\begin{center} on input line 10 ended by \end{tabularx}. \end{tabularx}
Misplaced alignment tab character &. \cline{2-2}} 11111000000 &

as mentioned in comments I removed extra bracket in cline and included package tabularx

\documentclass{article}
%\usepackage{siunitx}
%\sisetup{
%round-mode = places,
%round-precision = 2, 
%}

\usepackage{tabularx}
\begin{document}
\begin{table}[h!]
\begin{center}

\begin{tabularx}{| X | X | X |}
\hline
\textbf{Value 1} & \textbf{Value 2} & \textbf{Value 3}\\
$\alpha$ & $\beta$ & $\gamma$ \\
\hline
1 & 1110.1 & a \\
2 & 10.1  & b \\
3 & 23.113231 & c \\
\hline
\end{tabularx}
\end{center}
\caption{Your first label}
\label{tab:table1}
\end{table}
Second table
\begin{table} [h!]
\begin{center}
\begin{tabular}{|r | l |}
    \hline
    7C0 & hexadecimal \\
    3700 & octal \\
    \cline{2-2} 11111000000 & binary \\
    \hline
\end{tabular}
\end{center}
\caption{Your second label}
\label{tab:table2}
\end{table}


\begin{tabular}{cc}
    boring cell content & \parbox[t]{5cm}{rather long par\\new par}
\end{tabular}

\end{document}

now the errors I have are

line 12: Environment tabularx undefined. \begin{tabularx}
line 13: Misplaced \noalign. \hline
line 14: Misplaced alignment tab character &. \textbf{Value 1} &
line 14: Misplaced alignment tab character &. \textbf{Value 1} & \textbf{Value 2} &
line 15: Misplaced alignment tab character &. $\alpha$ &
line 15: Misplaced alignment tab character &. $\alpha$ & $\beta$ &
line 16: Misplaced \noalign. \hline
line 17: Misplaced alignment tab character &. 1 &
line 17: Misplaced alignment tab character &. 1 & 1110.1 &
line 18: Misplaced alignment tab character &. 2 &
line 18: Misplaced alignment tab character &. 2 & 10.1 &
line 19: Misplaced alignment tab character &. 3 &
line 19: Misplaced alignment tab character &. 3 & 23.113231 &
line 20: Misplaced \noalign. \hline
line 21: \begin{center} on input line 10 ended by \end{tabularx}. \end{tabularx}
line 33: Misplaced alignment tab character &. \cline{2-2}} 11111000000 &

the tex studio shows following in red

and following

Answer 1

The red quadratic, buttom in Texstudio shows, that the compiling is running. When you want to cancel the process, press the red quadratic buttom. Then the compiling buttom will be green. If you use Miktex with installing "packages on the fly", then the compiling time get longer, when packages will be installed.

Answer 2

\documentclass{article}
\usepackage{tabularx}
\usepackage{siunitx}
\usepackage{booktabs}
\sisetup{table-format=4.6,
round-mode = places,
round-precision = 2, 
}

\begin{document}
    \begin{table}
    \centering
            \begin{tabularx}{0.5\textwidth}{| c | S | c |}
                \textbf{Value 1} & \textbf{Value 2} & \textbf{Value 3}\\
                $\alpha$ & $\beta$ & $\gamma$ \\
                1 & 1110.1 & a \\
                2 & 10.1  & b \\
                3 & 23.113231 & c \\
            \end{tabularx}
        \caption{Your first label}
        \label{tab:table1}
    \vspace*{1cm}   
            \begin{tabular}{|r | l |}   \hline
                7C0 & hexadecimal \\
                3700 & octal \\ \cline{2-2}
                11111000000 & binary \\     \hline
        \end{tabular} \\[1cm]

        \begin{tabular}{cc}
            boring cell content & \parbox[t]{5cm}{rather long par\\new par}
        \end{tabular}
    \end{table}
\end{document}