Candidates can use several methods to boost their writing speed for the UPSC Mains exams. Practicing under timed conditions can help develop a sense of urgency and improve time management skills. Regularly writing essays and answer summaries will enhance fluency and clarity. Developing a structured format for answers can save time, allowing candidates to focus on content rather than structure during the exam. Additionally, utilizing shorthand or bullet points for outline creation can facilitate quicker articulation of thoughts, ensuring comprehensive responses within the time constraints.