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Nginx
# Nginx — добавьте в блок server {}
add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Cross-Origin-Opener-Policy "..." always;
add_header Cross-Origin-Resource-Policy "..." always;
add_header Cross-Origin-Embedder-Policy "..." always;

Apache
# Apache — добавьте в .htaccess
Header always set Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'"
Header always set X-Frame-Options "SAMEORIGIN"
Header always set X-Content-Type-Options "nosniff"
Header always set X-XSS-Protection "1; mode=block"
Header always set Referrer-Policy "strict-origin-when-cross-origin"
Header always set Cross-Origin-Opener-Policy "..."
Header always set Cross-Origin-Resource-Policy "..."
Header always set Cross-Origin-Embedder-Policy "..."

Nginx
# Nginx — добавьте в http {} или server {}
gzip on;
gzip_types text/plain text/css application/json application/javascript text/xml application/xml text/javascript image/svg+xml;
gzip_min_length 256;
gzip_comp_level 6;
gzip_vary on;

Apache
# Apache — добавьте в .htaccess
<IfModule mod_deflate.c>
  AddOutputFilterByType DEFLATE text/html text/plain text/css application/json application/javascript text/xml application/xml text/javascript image/svg+xml
</IfModule>