public static Boolean sendEmail(){

    // Get template for emails
    Id templateId = [SELECT Id
                        FROM EmailTemplate
                        WHERE DeveloperName = 'Template'].Id;

    // Get the related accounts
    List<Account> accounts = [SELECT Id, Related_Lead__c FROM Account];

    List<Messaging.SingleEmailMessage> mails = new List<Messaging.SingleEmailMessage> ();

    // Create the emails
    for (Account acc: accounts) {
        // Create a new Email
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();

        // Set the Email template
        mail.setTemplateId(templateId);

        // Set the target account
        mail.setWhatId(acc.Id);

        // Set the recipient
        mail.setTargetObjectId(acc.Related_Lead__c);

        // Create PDF to attach to email
        PageReference pdf = Page.AccountPDF;
        pdf.getParameters().put('id', acc.Id);
        Blob b = pdf.getContent(); // ********* LIMITS ARE HIT HERE **********

        // Attach the PDF
        Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
        efa.setFileName('account.pdf');
        efa.setBody(b);
        mail.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});

        mails.add(mail);
    }

    // Send the emails
    Messaging.sendEmail(mails);
    return true;
}

Blob b = pdf.getContent(); // ********* LIMITS ARE HIT HERE **********

Id templateId = [SELECT Id
                    FROM EmailTemplate
                    WHERE DeveloperName = 'Template'].Id;

List<Account> accounts = [SELECT Id, Related_Lead__c FROM Account];

public static Boolean sendEmail(Account acct, Id templateId ){