% The following option preserves the space between words and letters,
% making it less likely to piss off your reviewers than the next option.
%\usepackage[subtle, lists=tight, wordspacing=normal, tracking=normal]{savetrees}

% The following option reduces the space between words and letters. Can save 0.5-1 column
% from a 12-page paper, but makes the paper slightly less readable.
\usepackage[subtle, lists=tight]{savetrees}

% Reduce the spacing around floats so that you do not need to manually set tons of \vspace.
\addtolength{\textfloatsep}{-0.2in} % spacing between floats and text
\addtolength{\floatsep}{-0.1in}     % spacing between two floats
\captionsetup[table]{font=small,skip=4pt}   % spacing between caption and figure
\captionsetup[figure]{font=small,skip=4pt}

% Make the section headings smaller.
\usepackage[small, compact]{titlesec}
\usepackage{titling}
\titlespacing*{\section}{0pt}{4pt}{3pt}
\titlespacing*{\subsection}{0pt}{3pt}{3pt}
\titlespacing*{\subsubsection}{0pt}{3pt}{3pt}

% Do not penalize widow and orphan lines
\widowpenalty=0 % Allow the end of a paragraph to overflow to the next page
\clubpenalty=0  % Allow the beginning of a paragraph to begin from the prev page